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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/(7-(6*i)) = 0
8/(7-6*i) = 0
i belongs to the empty set
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