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D( i )
2*i+2 = 0
2*i+2 = 0
2*i+2 = 0
2*i+2 = 0 // - 2
2*i = -2 // : 2
i = -2/2
i = -1
i in (-oo:-1) U (-1:+oo)
(9*i)/(2*i+2) = 0
9*i = 0 // : 9
i = 0
i = 0
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