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L = Lenghth, W = Width

2L + 2W = 200 square feet

W = 1/2 L - 5

2L + 2 (1/2 L - 5) = 200

2L + L - 10 = 200

3L = 210

L = 70 feet

W = 1/2 L -5, Thus W = 1/2(70) - 5 = 30 feet

W = 30 feet

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