Solve for L
L=\frac{P-2W}{2}
Solve for P
P=2\left(L+W\right)
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\frac{P}{2}-L=W
Swap sides so that all variable terms are on the left hand side.
-L=W-\frac{P}{2}
Subtract \frac{P}{2} from both sides.
-2L=2W-P
Multiply both sides of the equation by 2.
\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.
\frac{P}{2}-L=W
Swap sides so that all variable terms are on the left hand side.
\frac{P}{2}=W+L
Add L to both sides.
P=2W+2L
Multiply both sides of the equation by 2.
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