Answer
$$r=\frac{b}{a+c};\quad \:a\ne \:-c$$
Work Step by Step
Solving the equation by using the rules of Algebra to isolate the given variable, we obtain:
$$ ar+cr=b\\ r\left(a+c\right)=b\\ r=\frac{b}{a+c};\quad \:a\ne \:-c$$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 9 - Inequalities and Problem Solving - 9.1 Inequalities and Applications - 9.1 Exercise Set - Page 583: 61
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