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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)
(8-(6*i))/(3*i) = 0
(8-6*i)/(3*i) = 0
8-6*i = 0 // - 8
-6*i = -8 // : -6
i = -8/(-6)
i = 4/3
i = 4/3
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