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W in (-oo:+oo)
W/6.4 = 1/2 // - 1/2
W/6.4-(1/2) = 0
W/6.4-1/2 = 0
0.15625*W-1/2 = 0 // + 1/2
0.15625*W = 1/2 // : 0.15625
W = 1/2/0.15625
W = 3.2
W = 3.2
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