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