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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)
(6*x^2-(5*x)+9)/(2*x-1) = 0
(6*x^2-5*x+9)/(2*x-1) = 0
6*x^2-5*x+9 = 0
6*x^2-5*x+9 = 0
DELTA = (-5)^2-(4*6*9)
DELTA = -191
DELTA < 0
1 = 0
1/(2*x-1) = 0
x belongs to the empty set
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