Answer
$x=10$
Work Step by Step
$9x-12=78\rightarrow$ add 12 to both sides
$9x-12+12=78+12\rightarrow$ simplify
$9x=90\rightarrow$ divide both sides by 9
$9x\div9=90\div9\rightarrow$ simplify
$x=10$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 3 - Section 3.2 - Solving Equations: Review of the Addition and Multiplication Properties - Exercise Set - Page 180: 55
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