Answer
$r=-6$
Work Step by Step
$7=r+13$
Subtract 13 from both sides.
$7-13=r+13-13$
$-6=r+0$
$r=-6$
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: 19
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