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D( z )
z-4 = 0
z-4 = 0
z-4 = 0
z-4 = 0 // + 4
z = 4
z in (-oo:4) U (4:+oo)
(4-z)/(z-4) = 0
4-z = 0 // - 4
-z = -4 // * -1
z = 4
z in { 4}
z belongs to the empty set
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