p = 2m + 2w solve for m
P = 2m + 2wAdd -2w on both sides of the equations2m = p - 2wDivide both sides by 22w = p = 2m / 2 /2m = 1 / 2 p - w
p = 2m + 2w-2w -2w p - 2w = 2m divide by 2 1/2p - w = m so m = 1/2p -w