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D( I )
4-I = 0
4-I = 0
4-I = 0
4-I = 0 // - 4
-I = -4 // * -1
I = 4
I in (-oo:4) U (4:+oo)
(2-I)/(4-I) = 0
2-I = 0 // - 2
-I = -2 // * -1
I = 2
I = 2
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