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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
6 = -5/w-4 // + -5/w-4
4-(-5/w)+6 = 0
5*w^-1+4+6 = 0
5*w^-1 = -10 // : 5
w^-1 = -2
-1 < 0
1/(w^1) = -2 // * w^1
1 = -2*w^1 // : -2
-1/2 = w^1
w = -1/2
w = -1/2
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