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