Answer
$a=2b-x$
Work Step by Step
$2(x+a)=4b \\\\ x+a=2b \\\\ a=2b-x$
We first divide both sides by two. Then, we isolate a by subtracting x to get the answer.
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 - 2-5 Literal Equations and Formulas - Practice and Problem-Solving Exercises - Page 113: 41
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