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W in (-oo:+oo)
W/(-3) = -2.8 // + 2.8
W/(-3)+2.8 = 0
2.8-1/3*W = 0 // - 2.8
-1/3*W = -2.8 // : -1/3
W = -2.8/(-1/3)
W = 8.40000008
W = 8.40000008
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