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D( i )
9-(8*i) = 0
9-(8*i) = 0
9-(8*i) = 0
9-8*i = 0
9-8*i = 0 // - 9
-8*i = -9 // : -8
i = -9/(-8)
i = 9/8
i in (-oo:9/8) U (9/8:+oo)
4/(9-(8*i)) = 0
4/(9-8*i) = 0
4 = 0
i belongs to the empty set
i belongs to the empty set
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