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D( i )
8-i = 0
8-i = 0
8-i = 0
8-i = 0 // - 8
-i = -8 // * -1
i = 8
i in (-oo:8) U (8:+oo)
(i+8)/(8-i) = 0
i+8 = 0 // - 8
i = -8
i = -8
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