one side of a rectangle is 15 centimeters longer than the other side. the perimeter of the rectangle is 94 centimeters. what is the width of the rectangle?

P = 2L + 2W

94 = 2(W + 15) + 2W
94 = 2W + 30 + 2W
94 = 4W + 30
64/4 = W
? = W