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D( i )
6-i = 0
6-i = 0
6-i = 0
6-i = 0 // - 6
-i = -6 // * -1
i = 6
i in (-oo:6) U (6:+oo)
7/(6-i) = 0
7 = 0
i belongs to the empty set
i belongs to the empty set
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