Solve for m
\left\{\begin{matrix}m=\frac{A}{r^{2}}\text{, }&r\neq 0\\m\in \mathrm{R}\text{, }&A=0\text{ and }r=0\end{matrix}\right.
Solve for A
A=mr^{2}
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mr^{2}=A
Swap sides so that all variable terms are on the left hand side.
r^{2}m=A
The equation is in standard form.
\frac{r^{2}m}{r^{2}}=\frac{A}{r^{2}}
Divide both sides by r^{2}.
m=\frac{A}{r^{2}}
Dividing by r^{2} undoes the multiplication by r^{2}.
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