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