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D( z )
z^-6 = 0
z = 0
z^-6 = 0
z^-6 = 0
1*z^-6 = 0 // : 1
z^-6 = 0
z należy do O
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(z^-9)/(z^-6) = 0
1*z^-3 = 0 // : 1
z^-3 = 0
z należy do O
z belongs to the empty set
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