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D( i )
2-i = 0
2-i = 0
2-i = 0
2-i = 0 // - 2
-i = -2 // * -1
i = 2
i in (-oo:2) U (2:+oo)
(6*i+28)/(2-i) = 0
6*i+28 = 0 // - 28
6*i = -28 // : 6
i = -28/6
i = -14/3
i = -14/3
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