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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)
(7-(6*i))/(3*i+2) = 0
(7-6*i)/(3*i+2) = 0
7-6*i = 0 // - 7
-6*i = -7 // : -6
i = -7/(-6)
i = 7/6
i = 7/6
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