Solve for A
\left\{\begin{matrix}A=\frac{EF}{D}\text{, }&D\neq 0\\A\in \mathrm{R}\text{, }&\left(E=0\text{ or }F=0\right)\text{ and }D=0\end{matrix}\right.
Solve for D
\left\{\begin{matrix}D=\frac{EF}{A}\text{, }&A\neq 0\\D\in \mathrm{R}\text{, }&\left(E=0\text{ or }F=0\right)\text{ and }A=0\end{matrix}\right.
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AD=EF
Swap sides so that all variable terms are on the left hand side.
DA=EF
The equation is in standard form.
\frac{DA}{D}=\frac{EF}{D}
Divide both sides by D.
A=\frac{EF}{D}
Dividing by D undoes the multiplication by D.
AD=EF
Swap sides so that all variable terms are on the left hand side.
\frac{AD}{A}=\frac{EF}{A}
Divide both sides by A.
D=\frac{EF}{A}
Dividing by A undoes the multiplication by A.
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