## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$n=\dfrac{p}{a+r}$
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}