Solve for M
\left\{\begin{matrix}M=\frac{F}{c^{2}}\text{, }&c\neq 0\\M\in \mathrm{R}\text{, }&F=0\text{ and }c=0\end{matrix}\right.
Solve for F
F=Mc^{2}
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Mc^{2}=F
Swap sides so that all variable terms are on the left hand side.
c^{2}M=F
The equation is in standard form.
\frac{c^{2}M}{c^{2}}=\frac{F}{c^{2}}
Divide both sides by c^{2}.
M=\frac{F}{c^{2}}
Dividing by c^{2} undoes the multiplication by c^{2}.
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