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D( i )
-2*i = 0
-2*i = 0
-2*i = 0
-2*i = 0 // : -2
i = 0
i in (-oo:0) U (0:+oo)
(5*i+6)/(-2*i) = 0
5*i+6 = 0 // - 6
5*i = -6 // : 5
i = -6/5
i = -6/5
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