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D( i )
3-(9*i) = 0
3-(9*i) = 0
3-(9*i) = 0
3-9*i = 0
3-9*i = 0 // - 3
-9*i = -3 // : -9
i = -3/(-9)
i = 1/3
i in (-oo:1/3) U (1/3:+oo)
(6-i)/(3-(9*i)) = 0
(6-i)/(3-9*i) = 0
6-i = 0 // - 6
-i = -6 // * -1
i = 6
i = 6
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