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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(3/2)*z+4/z = 1/3 // - 1/3
(3/2)*z+4/z-(1/3) = 0
(3/2)*z+4/z-1/3 = 0
3/2*z^1+4*z^-1-1/3*z^0 = 0
(3/2*z^2-1/3*z^1+4*z^0)/(z^1) = 0 // * z^2
z^1*(3/2*z^2-1/3*z^1+4*z^0) = 0
z^1
(3/2)*z^2+(-1/3)*z+4 = 0
(3/2)*z^2+(-1/3)*z+4 = 0
DELTA = (-1/3)^2-(4*4*(3/2))
DELTA = -215/9
DELTA < 0
z in { }
z belongs to the empty set
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