Solve for h
\left\{\begin{matrix}h=\frac{2d}{q}\text{, }&q\neq 0\\h\in \mathrm{R}\text{, }&d=0\text{ and }q=0\end{matrix}\right.
Solve for d
d=\frac{hq}{2}
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\frac{1}{2}hq=d
Swap sides so that all variable terms are on the left hand side.
\frac{q}{2}h=d
The equation is in standard form.
\frac{2\times \frac{q}{2}h}{q}=\frac{2d}{q}
Divide both sides by \frac{1}{2}q.
h=\frac{2d}{q}
Dividing by \frac{1}{2}q undoes the multiplication by \frac{1}{2}q.
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