Answer
$a=9$
Work Step by Step
$a+3=12$
Subtract 3 from both sides.
$a+3-3=12-3$
$a+0=9$
$a=9$
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: 10
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