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