Solve for q
\left\{\begin{matrix}q=\frac{p}{rs}\text{, }&s\neq 0\text{ and }r\neq 0\\q\in \mathrm{R}\text{, }&\left(s=0\text{ or }r=0\right)\text{ and }p=0\end{matrix}\right.
Solve for p
p=qrs
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rqs=p
Swap sides so that all variable terms are on the left hand side.
rsq=p
The equation is in standard form.
\frac{rsq}{rs}=\frac{p}{rs}
Divide both sides by rs.
q=\frac{p}{rs}
Dividing by rs undoes the multiplication by rs.
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