Solve for F
\left\{\begin{matrix}F=\frac{E}{h}\text{, }&h\neq 0\\F\in \mathrm{R}\text{, }&E=0\text{ and }h=0\end{matrix}\right.
Solve for E
E=Fh
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hF=E
Swap sides so that all variable terms are on the left hand side.
\frac{hF}{h}=\frac{E}{h}
Divide both sides by h.
F=\frac{E}{h}
Dividing by h undoes the multiplication by h.
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