Answer
$t=\dfrac{A}{a+b}$
Work Step by Step
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}
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