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D( i )
5-(8*i) = 0
5-(8*i) = 0
5-(8*i) = 0
5-8*i = 0
5-8*i = 0 // - 5
-8*i = -5 // : -8
i = -5/(-8)
i = 5/8
i in (-oo:5/8) U (5/8:+oo)
4/(5-(8*i)) = 0
4/(5-8*i) = 0
4 = 0
i belongs to the empty set
i belongs to the empty set
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