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