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