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x in (-oo:+oo)
x^2-x+1/2 = -1/2 // + -1/2
x^2-x+1/2-(-1/2) = 0
x^2-x+1/2+1/2 = 0
x^2-x+1 = 0
DELTA = (-1)^2-(1*1*4)
DELTA = -3
DELTA < 0
x belongs to the empty set
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