Answer
$a=-2$
Work Step by Step
We are given the equation $-12a-3=21$. In order to solve, we can first add 3 to both sides.
$-12a-3+3=21+3$
$-12a=24$
Divide both sides by -12.
$\frac{-12a}{-12}=\frac{24}{-12}$
$a=-2$
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
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 676: 12
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