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x in (-oo:+oo)
6*x^2-(13*x)-((8/2)*x)+1 = 0
6*x^2-13*x-4*x+1 = 0
6*x^2-17*x+1 = 0
DELTA = (-17)^2-(1*4*6)
DELTA = 265
DELTA > 0
x = (265^(1/2)+17)/(2*6) or x = (17-265^(1/2))/(2*6)
x = (265^(1/2)+17)/12 or x = (17-265^(1/2))/12
x in { (17-265^(1/2))/12, (265^(1/2)+17)/12 }
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