Need help!! Please help me figure this out

What is the length of 7ft more than twice the width and an area of the rectangle is 99ft^2. Find the dimension?

L = 7 + 2 w

L w = 99

(7+2w)w = 99

2 w^2 + 7 w - 99 = 0
(2w -11)(w+9) = 0
w = 11/2

L = 7 + 11 = 18