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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(3/8)/z = 1/3 // - 1/3
(3/8)/z-(1/3) = 0
(3/8)/z-1/3 = 0
3/8*z^-1 = 1/3 // : 3/8
z^-1 = 8/9
-1 < 0
1/(z^1) = 8/9 // * z^1
1 = 8/9*z^1 // : 8/9
9/8 = z^1
z = 9/8
z = 9/8
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