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D( i )
6-(9*i) = 0
6-(9*i) = 0
6-(9*i) = 0
6-9*i = 0
6-9*i = 0 // - 6
-9*i = -6 // : -9
i = -6/(-9)
i = 2/3
i in (-oo:2/3) U (2/3:+oo)
(5-(2*i))/(6-(9*i)) = 0
(5-2*i)/(6-9*i) = 0
5-2*i = 0 // - 5
-2*i = -5 // : -2
i = -5/(-2)
i = 5/2
i = 5/2
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