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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)
(4-i)/(3*i+2) = 0
4-i = 0 // - 4
-i = -4 // * -1
i = 4
i = 4
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