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