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D( i )
3-(2*i) = 0
3-(2*i) = 0
3-(2*i) = 0
3-2*i = 0
3-2*i = 0 // - 3
-2*i = -3 // : -2
i = -3/(-2)
i = 3/2
i in (-oo:3/2) U (3/2:+oo)
(5-i)/(3-(2*i)) = 0
(5-i)/(3-2*i) = 0
5-i = 0 // - 5
-i = -5 // * -1
i = 5
i = 5
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