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D( i )
3*i+4 = 0
3*i+4 = 0
3*i+4 = 0
3*i+4 = 0 // - 4
3*i = -4 // : 3
i = -4/3
i in (-oo:-4/3) U (-4/3:+oo)
(9*i+7)/(3*i+4) = 0
9*i+7 = 0 // - 7
9*i = -7 // : 9
i = -7/9
i = -7/9
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