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D( z )
3*z^5 = 0
3*z^5 = 0
3*z^5 = 0
3*z^5 = 0 // : 3
z^5 = 0
z = 0
z in (-oo:0) U (0:+oo)
(6*z)/(3*z^5) = 0
2*z^-4 = 0 // : 2
z^-4 = 0
z należy do O
z belongs to the empty set
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