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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
3/z = 1/8 // - 1/8
3/z-(1/8) = 0
3/z-1/8 = 0
3*z^-1 = 1/8 // : 3
z^-1 = 1/24
-1 < 0
1/(z^1) = 1/24 // * z^1
1 = 1/24*z^1 // : 1/24
24 = z^1
z = 24
z = 24
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