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x in (-oo:+oo)
(1/3)*x^2-(2*x) = 0
(1/3)*x^2-2*x = 0
1/3*x^2-2*x = 0
DELTA = (-2)^2-(0*1/3*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)+2)/(1/3*2) or x = (2-4^(1/2))/(1/3*2)
x = 6 or x = 0
x in { 0, 6 }
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