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