Solve for f
\left\{\begin{matrix}f=\frac{uz}{x}\text{, }&x\neq 0\text{ and }z\neq 0\\f\in \mathrm{R}\text{, }&u=0\text{ and }x=0\text{ and }z\neq 0\end{matrix}\right.
Solve for u
u=\frac{fx}{z}
z\neq 0
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uz=xf
Multiply both sides of the equation by z.
xf=uz
Swap sides so that all variable terms are on the left hand side.
\frac{xf}{x}=\frac{uz}{x}
Divide both sides by x.
f=\frac{uz}{x}
Dividing by x undoes the multiplication by x.
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