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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)
(3*x-1)*(1/(2*x-1)) = 0
(1*(3*x-1))/(2*x-1) = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x = 1/3
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