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