Solve for a
\left\{\begin{matrix}a=\frac{V+h}{2w}\text{, }&w\neq 0\\a\in \mathrm{R}\text{, }&V=-h\text{ and }w=0\end{matrix}\right.
Solve for V
V=-\left(h-2aw\right)
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2aw-h=V
Swap sides so that all variable terms are on the left hand side.
2aw=V+h
Add h to both sides.
2wa=V+h
The equation is in standard form.
\frac{2wa}{2w}=\frac{V+h}{2w}
Divide both sides by 2w.
a=\frac{V+h}{2w}
Dividing by 2w undoes the multiplication by 2w.
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