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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)
(19*i+3)/(3*i+1) = 0
19*i+3 = 0 // - 3
19*i = -3 // : 19
i = -3/19
i = -3/19
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