It depends on the value of w.
w < 6 then 6w < 36
w = 6 then 6w = 36 and
w > 6 then 6w >36
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-6w and -3w
7w - 4w - 6w = (7 - 4 - 6)w = -3w
Designate the width by w. Then, from the problem statement, the length = 6 + 2w. The perimeter is twice the width plus twice the length, or: 2w + 2(2w + 6) = 36; or 2w + 4w + 12 = 36; or 6w = 24 or w = 4 meters; the length is 14 meters.
w x 6w = 216 ie 6w2 = 216 so w2 = 36 making w = 6 and L = 36 so Perimeter = 2 x (6 + 36) ie 84 ft
15