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