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x^2-(1*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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