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D( i )
6-(4*i) = 0
6-(4*i) = 0
6-(4*i) = 0
6-4*i = 0
6-4*i = 0 // - 6
-4*i = -6 // : -4
i = -6/(-4)
i = 3/2
i in (-oo:3/2) U (3/2:+oo)
(5-(3*i))/(6-(4*i)) = 0
(5-3*i)/(6-4*i) = 0
5-3*i = 0 // - 5
-3*i = -5 // : -3
i = -5/(-3)
i = 5/3
i = 5/3
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