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w^2 +16 = 8w
w^2 +16-8w = 0
(w-4)^2 = 0
(w-4) = 0
w=4
answer is 4
2w +2(2w+1) = 50
2w +4w +2 =50
6w +2 =50
6w = 48
w = 48/6
w=8
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