Solve the equation P=2l+2w for the variable w.
p=2L+2w for w.p = perimeter of a rectanglep = 2Length + 2Width.P = 2L + 2W.subtract 2L from both sides.P -2l = 2W.2W = P - 2L.divide both sides by 2.W = P/2 - L.Done.
