You can put this solution on YOUR website! Think of a perimeter as a fence. It requires 2 lengths and 2 widths to enclose.
P = 2L + 2W
You're given the value of P as 72
72 = 2L + 2W
You're given the value of W
72 = 2L + 2(14)
72 = 2L + 28
Subtract 28 from each side
44 = 2L
Divide each side by 2
L = 22