Answer
$r=-3$
Work Step by Step
Step 1. Combine like terms on the right side of the equation.
$3r-9r=(3-9)r=-6r=18$
Step 2. Divide both sides by -6.
$\frac{-6r}{-6}=\frac{18}{-6}$
$r=-3$
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 - 9.7 Solving Equations with Several Steps - 9.7 Exercises - Page 679: 48
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