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W in (-oo:+oo)
W/2.68 = -3.4 // + 3.4
W/2.68+3.4 = 0
0.37313433*W+3.4 = 0 // - 3.4
0.37313433*W = -3.4 // : 0.37313433
W = -3.4/0.37313433
W = -9.11199996
W = -9.11199996
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