## Intermediate Algebra (12th Edition)

$t=\dfrac{d}{r}$
Using the properties of equality, in terms of $t ,$ the given formula, $d=rt ,$ is equivalent to \begin{array}{l}\require{cancel} \dfrac{d}{r}=\dfrac{rt}{r} \\\\ \dfrac{d}{r}=t \\\\ t=\dfrac{d}{r} .\end{array}