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w in (-oo:+oo)
w/2-(3*6) = 53 // - 53
w/2-(3*6)-53 = 0
w/2-53-18 = 0
1/2*w-71 = 0 // + 71
1/2*w = 71 // : 1/2
w = 71/1/2
w = 142
w = 142
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