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