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