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x in (-oo:+oo)
x^2 = x/3 // - x/3
x^2-(x/3) = 0
x^2-1/3*x = 0
DELTA = (-1/3)^2-(0*1*4)
DELTA = 1/9
DELTA > 0
x = ((1/9)^(1/2)+1/3)/(1*2) or x = (1/3-(1/9)^(1/2))/(1*2)
x = 1/3 or x = 0
x in { 0, 1/3 }
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