Solve for H
\left\{\begin{matrix}H=\frac{A}{LW}\text{, }&W\neq 0\text{ and }L\neq 0\\H\in \mathrm{R}\text{, }&\left(W=0\text{ or }L=0\right)\text{ and }A=0\end{matrix}\right.
Solve for A
A=HLW
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LWH=A
Swap sides so that all variable terms are on the left hand side.
\frac{LWH}{LW}=\frac{A}{LW}
Divide both sides by LW.
H=\frac{A}{LW}
Dividing by LW undoes the multiplication by LW.
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