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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(1/(-3))*z^-2 = 0
-1/3*z^-2 = 0 // : -1/3
z^-2 = 0
z naleu017Cy do O
z belongs to the empty set
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