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D( i )
-i = 0
-i = 0
i = 0
i in (-oo:0) U (0:+oo)
(2-(7*i))/(-i) = 0
(2-7*i)/(-i) = 0
2-7*i = 0 // - 2
-7*i = -2 // : -7
i = -2/(-7)
i = 2/7
i = 2/7
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