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x in (-oo:+oo)
x^2-x = 0-(2/3) // - 0-(2/3)
x^2-x+2/3+0 = 0
x^2-x+2/3 = 0
x^2-x+2/3 = 0
DELTA = (-1)^2-(2/3*1*4)
DELTA = -5/3
DELTA < 0
x belongs to the empty set
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