Tia needs 169 feet of fencing to enclose the back yard pool in Portland. Since one side is adjacent to the house, she will only need to fence three sides. There are two long sides and one shorter side parallel to the house, and the length of the long side is 3 feet less than two times the length of the short side.

Write an equation for
L
, the length of the long side, in terms of
S
, the length of the short side: