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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
6/z-3 = 8/5 // - 8/5
6/z-(8/5)-3 = 0
6/z-8/5-3 = 0
6*z^-1 = 23/5 // : 6
z^-1 = 23/30
-1 < 0
1/(z^1) = 23/30 // * z^1
1 = 23/30*z^1 // : 23/30
30/23 = z^1
z = 30/23
z = 30/23
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