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