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w in (-oo:+oo)
w/2-(3*6.2) = 53 // - 53
w/2-(3*6.2)-53 = 0
w/2-53-18.6 = 0
1/2*w-71.6 = 0 // + 71.6
1/2*w = 71.6 // : 1/2
w = 71.6/1/2
w = 143.2
w = 143.2
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