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