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