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