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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
5/w = 6/9 // - 6/9
5/w-(6/9) = 0
5/w-2/3 = 0
5*w^-1 = 2/3 // : 5
w^-1 = 2/15
-1 < 0
1/(w^1) = 2/15 // * w^1
1 = 2/15*w^1 // : 2/15
15/2 = w^1
w = 15/2
w = 15/2
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