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