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D( i )
8-(3*i) = 0
8-(3*i) = 0
8-(3*i) = 0
8-3*i = 0
8-3*i = 0 // - 8
-3*i = -8 // : -3
i = -8/(-3)
i = 8/3
i in (-oo:8/3) U (8/3:+oo)
(8-i)/(8-(3*i)) = 0
(8-i)/(8-3*i) = 0
8-i = 0 // - 8
-i = -8 // * -1
i = 8
i = 8
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