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