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D( i )
5*i+1 = 0
5*i+1 = 0
5*i+1 = 0
5*i+1 = 0 // - 1
5*i = -1 // : 5
i = -1/5
i in (-oo:-1/5) U (-1/5:+oo)
(2*i+3)/(5*i+1) = 0
2*i+3 = 0 // - 3
2*i = -3 // : 2
i = -3/2
i = -3/2
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