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D( z )
z^17 = 0
z^17 = 0
z^17 = 0
1*z^17 = 0 // : 1
z^17 = 0
z = 0
z in (-oo:0) U (0:+oo)
(z^8)/(z^17) = 0
1*z^-9 = 0 // : 1
z^-9 = 0
z należy do O
z belongs to the empty set
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