Solve for c
\left\{\begin{matrix}c=\frac{2A}{13m}\text{, }&m\neq 0\\c\in \mathrm{R}\text{, }&A=0\text{ and }m=0\end{matrix}\right.
Solve for A
A=\frac{13cm}{2}
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6.5cm=A
Swap sides so that all variable terms are on the left hand side.
\frac{13m}{2}c=A
The equation is in standard form.
\frac{2\times \frac{13m}{2}c}{13m}=\frac{2A}{13m}
Divide both sides by 6.5m.
c=\frac{2A}{13m}
Dividing by 6.5m undoes the multiplication by 6.5m.
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