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