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

$t=\dfrac{A}{a+b}$
Using the properties of equality, in terms of $t$, the given equation, $A=at+bt$, is equivalent to \begin{array}{l} A=t(a+b) \\\\ \dfrac{A}{a+b}=t \\\\ t=\dfrac{A}{a+b} .\end{array}