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