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W in (-oo:+oo)
W/2-(3*10) = 53 // - 53
W/2-(3*10)-53 = 0
W/2-53-30 = 0
1/2*W-83 = 0 // + 83
1/2*W = 83 // : 1/2
W = 83/1/2
W = 166
W = 166
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