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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)
(-(3*i)-3)/(3-(2*i)) = 0
(-3*i-3)/(3-2*i) = 0
-3*i-3 = 0 // + 3
-3*i = 3 // : -3
i = 3/(-3)
i = -1
i = -1
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