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