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x in (-oo:+oo)
3*x^2-(16*x)+5 = 1/3 // - 1/3
3*x^2-(16*x)-(1/3)+5 = 0
3*x^2-16*x-1/3+5 = 0
3*x^2-16*x+14/3 = 0
DELTA = (-16)^2-(3*4*14/3)
DELTA = 200
DELTA > 0
x = (200^(1/2)+16)/(2*3) or x = (16-200^(1/2))/(2*3)
x = (10*2^(1/2)+16)/6 or x = (16-10*2^(1/2))/6
x in { (16-10*2^(1/2))/6, (10*2^(1/2)+16)/6 }
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