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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)
(6*i)/(-2*i) = 0
-3 = 0
i belongs to the empty set
i belongs to the empty set
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