Solve for b
\left\{\begin{matrix}b=\frac{A}{m}\text{, }&m\neq 0\\b\in \mathrm{R}\text{, }&A=0\text{ and }m=0\end{matrix}\right.
Solve for A
A=bm
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mb=A
Swap sides so that all variable terms are on the left hand side.
\frac{mb}{m}=\frac{A}{m}
Divide both sides by m.
b=\frac{A}{m}
Dividing by m undoes the multiplication by m.
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