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