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D( i )
-i-5 = 0
-i-5 = 0
-i-5 = 0
-i-5 = 0 // + 5
-i = 5 // * -1
i = -5
i in (-oo:-5) U (-5:+oo)
1/(-i-5) = 0
1 = 0
i belongs to the empty set
i belongs to the empty set
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