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D( i )
7-(8*i) = 0
7-(8*i) = 0
7-(8*i) = 0
7-8*i = 0
7-8*i = 0 // - 7
-8*i = -7 // : -8
i = -7/(-8)
i = 7/8
i in (-oo:7/8) U (7/8:+oo)
2/(7-(8*i)) = 0
2/(7-8*i) = 0
i belongs to the empty set
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