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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
1/z-(1/z)-1 = 3 // - 3
1/z-(1/z)-3-1 = 0
1/z-z^-1-3-1 = 0
-4 = 0
z belongs to the empty set
z belongs to the empty set
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