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D( i )
6*i+2 = 0
6*i+2 = 0
6*i+2 = 0
6*i+2 = 0 // - 2
6*i = -2 // : 6
i = -2/6
i = -1/3
i in (-oo:-1/3) U (-1/3:+oo)
(5-(3*i))/(6*i+2) = 0
(5-3*i)/(6*i+2) = 0
5-3*i = 0 // - 5
-3*i = -5 // : -3
i = -5/(-3)
i = 5/3
i = 5/3
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