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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4*k+2/k = k // - k
4*k-k+2/k = 0
3*k^1+2*k^-1 = 0
(3*k^2+2*k^0)/(k^1) = 0 // * k^2
k^1*(3*k^2+2*k^0) = 0
k^1
3*k^2+2 = 0
3*k^2+2 = 0
DELTA = 0^2-(2*3*4)
DELTA = -24
DELTA < 0
k in { }
k belongs to the empty set
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