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D( W )
W = 0
W = 0
W = 0
W in (-oo:0) U (0:+oo)
228/W = 127 // - 127
228/W-127 = 0
228*W^-1 = 127 // : 228
W^-1 = 127/228
-1 < 0
1/(W^1) = 127/228 // * W^1
1 = 127/228*W^1 // : 127/228
228/127 = W^1
W = 228/127
W = 228/127
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