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D( i )
6-(8*i) = 0
6-(8*i) = 0
6-(8*i) = 0
6-8*i = 0
6-8*i = 0 // - 6
-8*i = -6 // : -8
i = -6/(-8)
i = 3/4
i in (-oo:3/4) U (3/4:+oo)
6/(6-(8*i)) = 0
6/(6-8*i) = 0
i belongs to the empty set
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