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D( i )
7*i = 0
7*i = 0
7*i = 0
7*i = 0 // : 7
i = 0
i in (-oo:0) U (0:+oo)
(-(1*i)-1)/(7*i) = 0
(-i-1)/(7*i) = 0
-i-1 = 0 // + 1
-i = 1 // * -1
i = -1
i = -1
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