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