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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)
(2*x-1)/(2-x) = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x = 1/2
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