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x in (-oo:+oo)
(x^2)/3-((2*x^1)/3)-3 = 0
(x^2)/3+(-2/3)*x-3 = 0
1/3*x^2-2/3*x-3 = 0
DELTA = (-2/3)^2-(-3*1/3*4)
DELTA = 40/9
DELTA > 0
x = ((40/9)^(1/2)+2/3)/(1/3*2) or x = (2/3-(40/9)^(1/2))/(1/3*2)
x = 3/2*((40/9)^(1/2)+2/3) or x = 3/2*(2/3-(40/9)^(1/2))
x in { 3/2*(2/3-(40/9)^(1/2)), 3/2*((40/9)^(1/2)+2/3) }
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