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x^2+x+2/3-(5/6) = 0
x^2+x+2/3-5/6 = 0
x^2+x-1/6 = 0
DELTA = 1^2-(-1/6*1*4)
DELTA = 5/3
DELTA > 0
x = ((5/3)^(1/2)-1)/(1*2) or x = (-(5/3)^(1/2)-1)/(1*2)
x = ((5/3)^(1/2)-1)/2 or x = (-((5/3)^(1/2)+1))/2
x in { (-((5/3)^(1/2)+1))/2, ((5/3)^(1/2)-1)/2 }
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