Answer
Addition and then division.
Work Step by Step
In order to cancel out the subtraction of 9, we must use addition. However, because x is still being multiplied by 2, we now must use division to isolate the variable and solve for x.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 2 - Solving Equations - 2-2 Solving Two-Step Equations - Lesson Check - Page 91: 7
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