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D( i )
8-(3*i) = 0
8-(3*i) = 0
8-(3*i) = 0
8-3*i = 0
8-3*i = 0 // - 8
-3*i = -8 // : -3
i = -8/(-3)
i = 8/3
i in (-oo:8/3) U (8/3:+oo)
9/(8-(3*i)) = 0
9/(8-3*i) = 0
9 = 0
i belongs to the empty set
i belongs to the empty set
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