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