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D( i )
-i-4 = 0
-i-4 = 0
-i-4 = 0
-i-4 = 0 // + 4
-i = 4 // * -1
i = -4
i in (-oo:-4) U (-4:+oo)
(3-(2*i))/(-i-4) = 0
(3-2*i)/(-i-4) = 0
3-2*i = 0 // - 3
-2*i = -3 // : -2
i = -3/(-2)
i = 3/2
i = 3/2
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