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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
45/w = 5 // - 5
45/w-5 = 0
45*w^-1 = 5 // : 45
w^-1 = 1/9
-1 < 0
1/(w^1) = 1/9 // * w^1
1 = 1/9*w^1 // : 1/9
9 = w^1
w = 9
w = 9
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