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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
7/z = 3/8 // - 3/8
7/z-(3/8) = 0
7/z-3/8 = 0
7*z^-1 = 3/8 // : 7
z^-1 = 3/56
-1 < 0
1/(z^1) = 3/56 // * z^1
1 = 3/56*z^1 // : 3/56
56/3 = z^1
z = 56/3
z = 56/3
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