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x in (-oo:+oo)
(1/3)*x-((1/6)*x^2) = 0
(-1/6)*x^2+(1/3)*x = 0
1/3*x-1/6*x^2 = 0
DELTA = (1/3)^2-(-1/6*0*4)
DELTA = 1/9
DELTA > 0
x = ((1/9)^(1/2)-1/3)/(-1/6*2) or x = (-(1/9)^(1/2)-1/3)/(-1/6*2)
x = 0 or x = 2
x in { 0, 2 }
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