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