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D( z )
z-1 = 0
z-1 = 0
z-1 = 0
z-1 = 0 // + 1
z = 1
z in (-oo:1) U (1:+oo)
8/(z-1) = 3 // - 3
8/(z-1)-3 = 0
8/(z-1)+(-3*(z-1))/(z-1) = 0
8-3*(z-1) = 0
11-3*z = 0
(11-3*z)/(z-1) = 0
(11-3*z)/(z-1) = 0 // * z-1
11-3*z = 0
11-3*z = 0 // - 11
-3*z = -11 // : -3
z = -11/(-3)
z = 11/3
z = 11/3
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