Solve for b
\left\{\begin{matrix}b=\frac{R-4p}{n}\text{, }&n\neq 0\\b\in \mathrm{R}\text{, }&R=4p\text{ and }n=0\end{matrix}\right.
Solve for R
R=bn+4p
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bn+4p=R
Swap sides so that all variable terms are on the left hand side.
bn=R-4p
Subtract 4p from both sides.
nb=R-4p
The equation is in standard form.
\frac{nb}{n}=\frac{R-4p}{n}
Divide both sides by n.
b=\frac{R-4p}{n}
Dividing by n undoes the multiplication by n.
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