### Home > CCA > Chapter 3 > Lesson 3.1.2 > Problem 3-21

3-21.

Simplify and solve each equation below for *x*. Record your work. Homework Help ✎

Use the CPM algebra tiles application.

Add 7 to both sides.

3*x*−7 = 2

+7 +7

3*x*= 9Divide both sides by 3.

*x*= 3

Combine like terms.

*x*+ 1 = 2*x*−5Move

*x*to one side by subtracting*x*from both sides.*x*+ 1 = 2*x*− 5

−*x*−*x*

1 =*x*−5Isolate

*x*by adding 5 to both sides.*x*−5 = 1

+5 +5*x*= 6

3 − 2

*x*= 2*x*− 5

Refer to parts (a) and (b).

Remember to check your work.

3 + 2

*x*− (*x*+ 1)*=*3*x*− 6

Refer to parts (a) and (b).

Remember to check your work.