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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
4 = 5/w-2 // - 5/w-2
2-(5/w)+4 = 0
2-5*w^-1+4 = 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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