Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapter 9 - Basic Algebra - 9.7 Solving Equations with Several Steps - 9.7 Exercises - Page 678: 53



Work Step by Step

Step 1. Subtract 7z from both sides of the equation. $9+7z-7z=9z-7z+13$ $9=2z+13$ Step 2. Subtract 13 from both sides. $9-13=2z+13-13$ $-4=2z$ Step 3. Divide both sides by 2. $\frac{-4}{2}=\frac{2z}{2}$ $z=-2$
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