Answer
$$A=\frac{W}{P}.$$
Work Step by Step
To solve the equation for $A$, we multiply both sides by $A$ and then we divide both sides by $P$ as follows:
$$PA=W\Longrightarrow \frac{PA}{P}=\frac{W}{P}=\Longrightarrow A=\frac{W}{P}.$$
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