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w in (-oo:+oo)
w/2-(3*11) = 53 // - 53
w/2-(3*11)-53 = 0
w/2-53-33 = 0
1/2*w-86 = 0 // + 86
1/2*w = 86 // : 1/2
w = 86/1/2
w = 172
w = 172
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