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x in (-oo:+oo)
(11/3)*x^2-((6/3)*x^2)+5*x = (1/3)*x // - (1/3)*x
(11/3)*x^2-((6/3)*x^2)+5*x-((1/3)*x) = 0
(11/3)*x^2-2*x^2+5*x+(-1/3)*x = 0
5/3*x^2+14/3*x = 0
DELTA = (14/3)^2-(0*5/3*4)
DELTA = 196/9
DELTA > 0
x = ((196/9)^(1/2)-14/3)/(5/3*2) or x = (-(196/9)^(1/2)-14/3)/(5/3*2)
x = 0 or x = -14/5
x in { -14/5, 0 }
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