Answer
$n=\dfrac{p}{a+r}$
Work Step by Step
Using the properties of equality, in terms of $
n
$, the given equation, $
an=p-rn
$, is equivalent to
\begin{array}{l}\require{cancel}
an+rn=p
\\\\
n(a+r)=p
\\\\
n=\dfrac{p}{a+r}
.\end{array}
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 1-2 - Cumulative Review - Page 152: 18
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