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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
4/z-(1/5)-1 = 3/z+1 // - 3/z+1
4/z-(3/z)-(1/5)-1-1 = 0
4/z-3*z^-1-1/5-1-1 = 0
1*z^-1 = 11/5 // : 1
z^-1 = 11/5
-1 < 0
1/(z^1) = 11/5 // * z^1
1 = 11/5*z^1 // : 11/5
5/11 = z^1
z = 5/11
z = 5/11
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