Solve for B
\left\{\begin{matrix}B=\frac{3V}{h}\text{, }&h\neq 0\\B\in \mathrm{R}\text{, }&V=0\text{ and }h=0\end{matrix}\right.
Solve for V
V=\frac{Bh}{3}
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\frac{1}{3}Bh=V
Swap sides so that all variable terms are on the left hand side.
\frac{h}{3}B=V
The equation is in standard form.
\frac{3\times \frac{h}{3}B}{h}=\frac{3V}{h}
Divide both sides by \frac{1}{3}h.
B=\frac{3V}{h}
Dividing by \frac{1}{3}h undoes the multiplication by \frac{1}{3}h.
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