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