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D( z )
z^4 = 0
z^4 = 0
z^4 = 0
1*z^4 = 0 // : 1
z^4 = 0
z = 0
z in (-oo:0) U (0:+oo)
(6/(z^4))^3 = 0
216*z^-12 = 0 // : 216
z^-12 = 0
z naleu017Cy do O
z belongs to the empty set
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