Solve for p
\left\{\begin{matrix}p=\frac{E}{r+1}\text{, }&r\neq -1\\p\in \mathrm{R}\text{, }&E=0\text{ and }r=-1\end{matrix}\right.
Solve for E
E=p\left(r+1\right)
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p+rp=E
Swap sides so that all variable terms are on the left hand side.
\left(1+r\right)p=E
Combine all terms containing p.
\left(r+1\right)p=E
The equation is in standard form.
\frac{\left(r+1\right)p}{r+1}=\frac{E}{r+1}
Divide both sides by 1+r.
p=\frac{E}{r+1}
Dividing by 1+r undoes the multiplication by 1+r.
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