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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(18/3)/w = 30 // - 30
(18/3)/w-30 = 0
6*w^-1 = 30 // : 6
w^-1 = 5
-1 < 0
1/(w^1) = 5 // * w^1
1 = 5*w^1 // : 5
1/5 = w^1
w = 1/5
w = 1/5
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