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