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