Prealgebra (7th Edition)

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: 55

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 $x=10$
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