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x in (-oo:+oo)
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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