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x in (-oo:+oo)
2*x^2-(x/4) = 0
2*x^2-1/4*x = 0
DELTA = (-1/4)^2-(0*2*4)
DELTA = 1/16
DELTA > 0
x = ((1/16)^(1/2)+1/4)/(2*2) or x = (1/4-(1/16)^(1/2))/(2*2)
x = 1/8 or x = 0
x in { 0, 1/8 }
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