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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
5 = 2/5-(8/z) // - 2/5-(8/z)
8/z-(2/5)+5 = 0
8/z-2/5+5 = 0
8*z^-1 = -23/5 // : 8
z^-1 = -23/40
-1 < 0
1/(z^1) = -23/40 // * z^1
1 = -23/40*z^1 // : -23/40
-40/23 = z^1
z = -40/23
z = -40/23
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