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W in (-oo:+oo)
W/4 = 120.3 // - 120.3
W/4-120.3 = 0
1/4*W-120.3 = 0 // + 120.3
1/4*W = 120.3 // : 1/4
W = 120.3/1/4
W = 481.2
W = 481.2
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