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x in (-oo:+oo)
(x^2)/0.25-x = 0
4*x^2-x = 0
DELTA = (-1)^2-(0*4*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)+1)/(2*4) or x = (1-1^(1/2))/(2*4)
x = 1/4 or x = 0
x in { 0, 1/4 }
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