Basic College Mathematics (9th Edition)

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: 48

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. $\frac{-6r}{-6}=\frac{18}{-6}$ $r=-3$
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