Answer
$h=\dfrac{2A}{b}$
Work Step by Step
Multiply $2$ to both sides:
$2 \cdot A = 2 \cdot \dfrac{1}{2}bh
\\2A = bh$
Divide by $b$ on both sides:
$\dfrac{2a}{b}=\dfrac{bh}{b}
\\\dfrac{2A}{b}=h
\\h=\dfrac{2A}{b}$
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