Answer
$z=5$
Work Step by Step
$12=z+7$
Subtract 7 from both sides.
$12-7=z+7-7$
$5=z+0$
$z=5$
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 9 - Basic Algebra - 9.6 Solving Equations - 9.6 Exercises - Page 670: 20
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