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D( x )
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
(5*x-2)/(2*x-1) = 0
5*x-2 = 0 // + 2
5*x = 2 // : 5
x = 2/5
x = 2/5
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