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