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D( z )
z-(4/6) = 0
z-(4/6) = 0
z-(4/6) = 0
z-2/3 = 0
z-2/3 = 0 // + 2/3
z = 2/3
z in (-oo:2/3) U (2/3:+oo)
(7*z-(28/4))/(z-(4/6)) = 0
(7*z-7)/(z-2/3) = 0
7*z-7 = 0 // + 7
7*z = 7 // : 7
z = 7/7
z = 1
z = 1
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