Solve for b
\left\{\begin{matrix}b=\frac{P}{rx}\text{, }&r\neq 0\text{ and }x\neq 0\\b\in \mathrm{R}\text{, }&\left(r=0\text{ or }x=0\right)\text{ and }P=0\end{matrix}\right.
Solve for P
P=brx
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bxr=P
Swap sides so that all variable terms are on the left hand side.
rxb=P
The equation is in standard form.
\frac{rxb}{rx}=\frac{P}{rx}
Divide both sides by xr.
b=\frac{P}{rx}
Dividing by xr undoes the multiplication by xr.
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