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3*x^2+x-(1/12) = 0
3*x^2+x-1/12 = 0
3*x^2+x-1/12 = 0
DELTA = 1^2-(-1/12*3*4)
DELTA = 2
DELTA > 0
x = (2^(1/2)-1)/(2*3) or x = (-2^(1/2)-1)/(2*3)
x = (2^(1/2)-1)/6 or x = (-(2^(1/2)+1))/6
x in { (-(2^(1/2)+1))/6, (2^(1/2)-1)/6 }
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