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w in (-oo:+oo)
w/2-(3*5) = 53 // - 53
w/2-(3*5)-53 = 0
w/2-53-15 = 0
1/2*w-68 = 0 // + 68
1/2*w = 68 // : 1/2
w = 68/1/2
w = 136
w = 136
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