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