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