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