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