Solve for P
P=2\left(w+l\right)
Solve for l
l=\frac{P-2w}{2}
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P-2l=2w
Swap sides so that all variable terms are on the left hand side.
P=2w+2l
Add 2l to both sides.
P-2l=2w
Swap sides so that all variable terms are on the left hand side.
-2l=2w-P
Subtract P from both sides.
\frac{-2l}{-2}=\frac{2w-P}{-2}
Divide both sides by -2.
l=\frac{2w-P}{-2}
Dividing by -2 undoes the multiplication by -2.
l=\frac{P}{2}-w
Divide 2w-P by -2.
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