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D( W )
W = 0
W = 0
W = 0
W in (-oo:0) U (0:+oo)
-6/W = 9 // - 9
-6/W-9 = 0
-6*W^-1 = 9 // : -6
W^-1 = -3/2
-1 < 0
1/(W^1) = -3/2 // * W^1
1 = -3/2*W^1 // : -3/2
-2/3 = W^1
W = -2/3
W = -2/3
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