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D( i )
1-(6*i) = 0
1-(6*i) = 0
1-(6*i) = 0
1-6*i = 0
1-6*i = 0 // - 1
-6*i = -1 // : -6
i = -1/(-6)
i = 1/6
i in (-oo:1/6) U (1/6:+oo)
(6-(4*i))/(1-(6*i)) = 0
(6-4*i)/(1-6*i) = 0
6-4*i = 0 // - 6
-4*i = -6 // : -4
i = -6/(-4)
i = 3/2
i = 3/2
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