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D( i )
-(2*i)-2 = 0
-(2*i)-2 = 0
-(2*i)-2 = 0
-2*i-2 = 0
-2*i-2 = 0 // + 2
-2*i = 2 // : -2
i = 2/(-2)
i = -1
i in (-oo:-1) U (-1:+oo)
4/(-(2*i)-2) = 0
4/(-2*i-2) = 0
4 = 0
i belongs to the empty set
i belongs to the empty set
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