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W in (-oo:+oo)
W/0.3 = -19 // + 19
W/0.3+19 = 0
3.33333333*W+19 = 0 // - 19
3.33333333*W = -19 // : 3.33333333
W = -19/3.33333333
W = -5.70000001
W = -5.70000001
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