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D( i )
1-(4*i) = 0
1-(4*i) = 0
1-(4*i) = 0
1-4*i = 0
1-4*i = 0 // - 1
-4*i = -1 // : -4
i = -1/(-4)
i = 1/4
i in (-oo:1/4) U (1/4:+oo)
(2-(3*i))/(1-(4*i)) = 0
(2-3*i)/(1-4*i) = 0
2-3*i = 0 // - 2
-3*i = -2 // : -3
i = -2/(-3)
i = 2/3
i = 2/3
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