Solve for c
\left\{\begin{matrix}c=\frac{a}{7m}\text{, }&m\neq 0\\c\in \mathrm{R}\text{, }&a=0\text{ and }m=0\end{matrix}\right.
Solve for a
a=7cm
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7cm=a
Swap sides so that all variable terms are on the left hand side.
7mc=a
The equation is in standard form.
\frac{7mc}{7m}=\frac{a}{7m}
Divide both sides by 7m.
c=\frac{a}{7m}
Dividing by 7m undoes the multiplication by 7m.
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