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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
8/z = 32/48 // - 32/48
8/z-(32/48) = 0
8/z-2/3 = 0
8*z^-1 = 2/3 // : 8
z^-1 = 1/12
-1 < 0
1/(z^1) = 1/12 // * z^1
1 = 1/12*z^1 // : 1/12
12 = z^1
z = 12
z = 12
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