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