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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)
(7-i)/(4-(9*i)) = 0
(7-i)/(4-9*i) = 0
7-i = 0 // - 7
-i = -7 // * -1
i = 7
i = 7
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