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Solve: 8 x + 9 x 5 x = −3 + 15 .

Solution

Start by combining like terms to simplify each side.

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Combine like terms. .
Divide both sides by 12 to isolate x. .
Simplify. .
Check your answer. Let x = 1
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Solve: 7 x + 6 x 4 x = −8 + 26 .

x = 2

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Solve: 11 n 3 n 6 n = 7 17 .

n = −5

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Solve: 11 20 = 17 y 8 y 6 y .

Solution

Simplify each side by combining like terms.

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Simplify each side. .
Divide both sides by 3 to isolate y. .
Simplify. .
Check your answer. Let y = −3
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Notice that the variable ended up on the right side of the equal sign when we solved the equation. You may prefer to take one more step to write the solution with the variable on the left side of the equal sign.

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Solve: 18 27 = 15 c 9 c 3 c .

c = −3

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Solve: 18 22 = 12 x x 4 x .

x = 4 7

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Solve: −3 ( n 2 ) 6 = 21 .

Solution

Remember—always simplify each side first.

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Distribute. .
Simplify. .
Divide both sides by -3 to isolate n. .
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Check your answer. Let n = −7 .
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Solve: −4 ( n 2 ) 8 = 24 .

n = −6

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Solve: −6 ( n 2 ) 12 = 30 .

n = −5

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Key concepts

  • Division and Multiplication Properties of Equality
    • Division Property of Equality: For all real numbers a, b, c, and c 0 , if a = b , then a c = b c .
    • Multiplication Property of Equality: For all real numbers a, b, c, if a = b , then a c = b c .

Practice makes perfect

Solve Equations Using the Division and Multiplication Properties of Equality

In the following exercises, solve each equation for the variable using the Division Property of Equality and check the solution.

In the following exercises, solve each equation for the variable using the Multiplication Property of Equality and check the solution.

Solve Equations That Need to be Simplified

In the following exercises, solve the equation.

8 a + 3 a 6 a = −17 + 27

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6 y 3 y + 12 y = −43 + 28

y = −1

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−9 x 9 x + 2 x = 50 2

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−5 m + 7 m 8 m = −6 + 36

m = −5

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100 16 = 4 p 10 p p

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−18 7 = 5 t 9 t 6 t

t = 5 2

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5 12 q + 1 2 q = 25 3

q = 24

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0.25 d + 0.10 d = 6 0.75

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0.05 p 0.01 p = 2 + 0.24

p = 56

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Everyday math

Balloons Ramona bought 18 balloons for a party. She wants to make 3 equal bunches. Find the number of balloons in each bunch, b , by solving the equation 3 b = 18 .

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Teaching Connie’s kindergarten class has 24 children. She wants them to get into 4 equal groups. Find the number of children in each group, g , by solving the equation 4 g = 24 .

6 children

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Ticket price Daria paid $36.25 for 5 children’s tickets at the ice skating rink. Find the price of each ticket, p , by solving the equation 5 p = 36.25 .

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Unit price Nishant paid $12.96 for a pack of 12 juice bottles. Find the price of each bottle, b , by solving the equation 12 b = 12.96 .

$1.08

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Fuel economy Tania’s SUV gets half as many miles per gallon (mpg) as her husband’s hybrid car. The SUV gets 18 mpg . Find the miles per gallons, m , of the hybrid car, by solving the equation 1 2 m = 18 .

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Fabric The drill team used 14 yards of fabric to make flags for one-third of the members. Find how much fabric, f , they would need to make flags for the whole team by solving the equation 1 3 f = 14 .

42 yards

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Writing exercises

Frida started to solve the equation −3 x = 36 by adding 3 to both sides. Explain why Frida’s method will result in the correct solution.

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Emiliano thinks x = 40 is the solution to the equation 1 2 x = 80 . Explain why he is wrong.

Answer will vary.

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Self check

After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.

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After reviewing this checklist, what will you do to become confident for all objectives?

Questions & Answers

what is phylogeny
Odigie Reply
evolutionary history and relationship of an organism or group of organisms
AI-Robot
ok
Deng
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the study of living organisms and their interactions with one another and their environments
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HOW CAN MAN ORGAN FUNCTION
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the diagram of the digestive system
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allimentary cannel
Ogenrwot
How does twins formed
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They formed in two ways first when one sperm and one egg are splited by mitosis or two sperm and two eggs join together
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Genetics is the study of heredity
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Misack
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discuss biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles
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the study of living organisms and their interactions with one another and their environment.
Wine
discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
Joseph Reply
what is the blood cells
Shaker Reply
list any five characteristics of the blood cells
Shaker
lack electricity and its more savely than electronic microscope because its naturally by using of light
Abdullahi Reply
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
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cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
Abdullahi
is like gone fail us
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cells is the basic structure and functions of all living things
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What is classification
ISCONT Reply
is organisms that are similar into groups called tara
Yamosa
in what situation (s) would be the use of a scanning electron microscope be ideal and why?
Kenna Reply
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
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Source:  OpenStax, Prealgebra. OpenStax CNX. Jul 15, 2016 Download for free at http://legacy.cnx.org/content/col11756/1.9
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