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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)
(0.5/(z-1))*(z-0.9)^2 = 0
(0.5*(z-0.9)^2)/(z-1) = 0
z-0.9 = 0 // + 0.9
z = 0.9
z in { 0.9, 0.9 }
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