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D( i )
i+5 = 0
i+5 = 0
i+5 = 0
i+5 = 0 // - 5
i = -5
i in (-oo:-5) U (-5:+oo)
(6-i)/(i+5) = 0
6-i = 0 // - 6
-i = -6 // * -1
i = 6
i = 6
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