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