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D( i )
3-(4*i) = 0
3-(4*i) = 0
3-(4*i) = 0
3-4*i = 0
3-4*i = 0 // - 3
-4*i = -3 // : -4
i = -3/(-4)
i = 3/4
i in (-oo:3/4) U (3/4:+oo)
(3*i-2)/(3-(4*i)) = 0
(3*i-2)/(3-4*i) = 0
3*i-2 = 0 // + 2
3*i = 2 // : 3
i = 2/3
i = 2/3
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