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