## Precalculus: Mathematics for Calculus, 7th Edition

$w = \frac{P-2l}{2}$
$Solve$ $the$ $equation$ $for$ $the$ $indicated$ $variable:$ $P = 2l + 2w;$ $for$ $w$ Solve for $w$ Subtract both sides by $2l$ $P-2l = 2l+2w-2l$ Simplify $P-2l = 2w$ Divide both sides by 2 $\frac{P-2l}{2} = \frac{2w}{2}$ Simplify $\frac{P-2l}{2} = w$ $w = \frac{P-2l}{2}$