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D( i )
9-i = 0
9-i = 0
9-i = 0
9-i = 0 // - 9
-i = -9 // * -1
i = 9
i in (-oo:9) U (9:+oo)
(8-(2*i))/(9-i) = 0
(8-2*i)/(9-i) = 0
8-2*i = 0 // - 8
-2*i = -8 // : -2
i = -8/(-2)
i = 4
i = 4
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