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x in (-oo:+oo)
x^2-((10/3)*x)+1 = 0
x^2+(-10/3)*x+1 = 0
x^2-10/3*x+1 = 0
DELTA = (-10/3)^2-(1*1*4)
DELTA = 64/9
DELTA > 0
x = ((64/9)^(1/2)+10/3)/(1*2) or x = (10/3-(64/9)^(1/2))/(1*2)
x = 3 or x = 1/3
x in { 1/3, 3 }
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