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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
z^-8*((2^7*z^-5)/(2^8)) = 0
1/2*z^-13 = 0 // : 1/2
z^-13 = 0
z należy do O
z belongs to the empty set
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