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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
6/w = 45 // - 45
6/w-45 = 0
6*w^-1 = 45 // : 6
w^-1 = 15/2
-1 < 0
1/(w^1) = 15/2 // * w^1
1 = 15/2*w^1 // : 15/2
2/15 = w^1
w = 2/15
w = 2/15
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