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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
15/w = 18/30 // - 18/30
15/w-(18/30) = 0
15/w-3/5 = 0
15*w^-1 = 3/5 // : 15
w^-1 = 1/25
-1 < 0
1/(w^1) = 1/25 // * w^1
1 = 1/25*w^1 // : 1/25
25 = w^1
w = 25
w = 25
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