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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
4*8*z+1/z+32/z+3 = 0
32*z^1+33*z^-1+3*z^0 = 0
(32*z^2+3*z^1+33*z^0)/(z^1) = 0 // * z^2
z^1*(32*z^2+3*z^1+33*z^0) = 0
z^1
32*z^2+3*z+33 = 0
32*z^2+3*z+33 = 0
DELTA = 3^2-(4*32*33)
DELTA = -4215
DELTA < 0
z in { }
z belongs to the empty set
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