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