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W in (-oo:+oo)
W/(-2) = 0.04 // - 0.04
W/(-2)-0.04 = 0
-1/2*W-0.04 = 0 // + 0.04
-1/2*W = 0.04 // : -1/2
W = 0.04/(-1/2)
W = -0.08
W = -0.08
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