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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)
z/(z-1) = 1/(z-1)+2 // - 1/(z-1)+2
z/(z-1)-(1/(z-1))-2 = 0
z/(z-1)-(z-1)^-1-2 = 0
z/(z-1)-1/(z-1)-2 = 0
z/(z-1)-1/(z-1)+(-2*(z-1))/(z-1) = 0
z-2*(z-1)-1 = 0
z-2*z-1+2 = 0
1-z = 0
(1-z)/(z-1) = 0
(1-z)/(z-1) = 0 // * z-1
1-z = 0
1-z = 0 // - 1
-z = -1 // * -1
z = 1
z in { 1}
z belongs to the empty set
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