Solve for f
\left\{\begin{matrix}f=\frac{4C}{m}\text{, }&m\neq 0\\f\in \mathrm{R}\text{, }&C=0\text{ and }m=0\end{matrix}\right.
Solve for C
C=\frac{fm}{4}
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\frac{1}{4}fm=C
Swap sides so that all variable terms are on the left hand side.
\frac{m}{4}f=C
The equation is in standard form.
\frac{4\times \frac{m}{4}f}{m}=\frac{4C}{m}
Divide both sides by \frac{1}{4}m.
f=\frac{4C}{m}
Dividing by \frac{1}{4}m undoes the multiplication by \frac{1}{4}m.
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