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