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