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