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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)
(2*i-5)/(3*i-4) = 0
2*i-5 = 0 // + 5
2*i = 5 // : 2
i = 5/2
i = 5/2
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