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D( i )
3-i = 0
3-i = 0
3-i = 0
3-i = 0 // - 3
-i = -3 // * -1
i = 3
i in (-oo:3) U (3:+oo)
2/(3-i) = 0
2 = 0
i belongs to the empty set
i belongs to the empty set
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