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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)
2-((2*i+3)/(2*i+3))-(3*i)-i-2 = 0
2-3*i-i-2-1 = 0
-4*i-1 = 0 // + 1
-4*i = 1 // : -4
i = 1/(-4)
i = -1/4
i = -1/4
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