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D( i )
8-(7*i) = 0
8-(7*i) = 0
8-(7*i) = 0
8-7*i = 0
8-7*i = 0 // - 8
-7*i = -8 // : -7
i = -8/(-7)
i = 8/7
i in (-oo:8/7) U (8/7:+oo)
3/(8-(7*i)) = 0
3/(8-7*i) = 0
i belongs to the empty set
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