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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
z^-5*((4^2*z^-3)/(4^3)) = 0
1/4*z^-8 = 0 // : 1/4
z^-8 = 0
z naleu017Cy do O
z belongs to the empty set
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