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D( i )
7-(6*i) = 0
7-(6*i) = 0
7-(6*i) = 0
7-6*i = 0
7-6*i = 0 // - 7
-6*i = -7 // : -6
i = -7/(-6)
i = 7/6
i in (-oo:7/6) U (7/6:+oo)
(8-i)/(7-(6*i)) = 0
(8-i)/(7-6*i) = 0
8-i = 0 // - 8
-i = -8 // * -1
i = 8
i = 8
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