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.
Examples
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Matrix
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Simultaneous equation
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Differentiation
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Limits
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