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D( i )
5-(9*i) = 0
5-(9*i) = 0
5-(9*i) = 0
5-9*i = 0
5-9*i = 0 // - 5
-9*i = -5 // : -9
i = -5/(-9)
i = 5/9
i in (-oo:5/9) U (5/9:+oo)
(8-i)/(5-(9*i)) = 0
(8-i)/(5-9*i) = 0
8-i = 0 // - 8
-i = -8 // * -1
i = 8
i = 8
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