## Algebra 1: Common Core (15th Edition)

Published by Prentice Hall

# Chapter 2 - Solving Equations - 2-2 Solving Two-Step Equations - Practice and Problem-Solving Exercises: 54

21

#### Work Step by Step

Set the expressions equal to one each other and then solve the equation. $70=3x+7$ (subtract 7 from both sides) $63=3x$ (isolate the variable by dividing 3 from both sides) $\frac{63}{3}$=x $21=x$ $x=21$ The solution is 21.

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