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