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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)
(3*i+3)/(3*i+6) = 0
3*i+3 = 0 // - 3
3*i = -3 // : 3
i = -3/3
i = -1
i = -1
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