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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
6/z-8 = -4 // + 4
6/z-8+4 = 0
6*z^-1 = 4 // : 6
z^-1 = 2/3
-1 < 0
1/(z^1) = 2/3 // * z^1
1 = 2/3*z^1 // : 2/3
3/2 = z^1
z = 3/2
z = 3/2
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