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D( i )
6-(5*i) = 0
6-(5*i) = 0
6-(5*i) = 0
6-5*i = 0
6-5*i = 0 // - 6
-5*i = -6 // : -5
i = -6/(-5)
i = 6/5
i in (-oo:6/5) U (6/5:+oo)
(10*i)/(6-(5*i)) = 0
(10*i)/(6-5*i) = 0
10*i = 0 // : 10
i = 0
i = 0
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