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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)
(3*x-8)/(2-x) = 0
3*x-8 = 0 // + 8
3*x = 8 // : 3
x = 8/3
x = 8/3
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