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