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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
15/w = 5/6 // - 5/6
15/w-(5/6) = 0
15/w-5/6 = 0
15*w^-1 = 5/6 // : 15
w^-1 = 1/18
-1 < 0
1/(w^1) = 1/18 // * w^1
1 = 1/18*w^1 // : 1/18
18 = w^1
w = 18
w = 18
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