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D( i )
8-(9*i) = 0
8-(9*i) = 0
8-(9*i) = 0
8-9*i = 0
8-9*i = 0 // - 8
-9*i = -8 // : -9
i = -8/(-9)
i = 8/9
i in (-oo:8/9) U (8/9:+oo)
(3-(4*i))/(8-(9*i)) = 0
(3-4*i)/(8-9*i) = 0
3-4*i = 0 // - 3
-4*i = -3 // : -4
i = -3/(-4)
i = 3/4
i = 3/4
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