Solve for B
\left\{\begin{matrix}B=-\frac{A-D-EV}{N}\text{, }&N\neq 0\\B\in \mathrm{R}\text{, }&A=D+EV\text{ and }N=0\end{matrix}\right.
Solve for A
A=EV+D-BN
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BN=D+EV-A
Subtract A from both sides.
NB=EV+D-A
The equation is in standard form.
\frac{NB}{N}=\frac{EV+D-A}{N}
Divide both sides by N.
B=\frac{EV+D-A}{N}
Dividing by N undoes the multiplication by N.
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