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