What is a simplified expression for this scenario in terms of length (l)?

Question

A picture frame’s width is 2 inches less than its length. What is a simplified expression for its perimeter in terms of its length (l)?

Answer 1

W=L-2

P=2(W+L)

P=2(L-2+L)

P(L) = 2(2L-2)

P(L) = 4L-4