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