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D( i )
3*i = 0
3*i = 0
3*i = 0
3*i = 0 // : 3
i = 0
i in (-oo:0) U (0:+oo)
(11-(6*i))/(3*i) = 0
(11-6*i)/(3*i) = 0
11-6*i = 0 // - 11
-6*i = -11 // : -6
i = -11/(-6)
i = 11/6
i = 11/6
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