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W in (-oo:+oo)
W/7.5 = 3 // - 3
W/7.5-3 = 0
0.13333333*W-3 = 0 // + 3
0.13333333*W = 3 // : 0.13333333
W = 3/0.13333333
W = 22.50000056
W = 22.50000056
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