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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
9 = 6/w // - 6/w
9-(6/w) = 0
9-6*w^-1 = 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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