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D( i )
2*i+4 = 0
2*i+4 = 0
2*i+4 = 0
2*i+4 = 0 // - 4
2*i = -4 // : 2
i = -4/2
i = -2
i in (-oo:-2) U (-2:+oo)
3/(2*i+4) = 0
i belongs to the empty set
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