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