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D( I )
2-I = 0
2-I = 0
2-I = 0
2-I = 0 // - 2
-I = -2 // * -1
I = 2
I in (-oo:2) U (2:+oo)
5/(2-I) = 0
5 = 0
I belongs to the empty set
I belongs to the empty set
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