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x in (-oo:+oo)
(1/3)*x^2-(2*x) = 1/5 // - 1/5
(1/3)*x^2-(2*x)-(1/5) = 0
(1/3)*x^2-2*x-1/5 = 0
1/3*x^2-2*x-1/5 = 0
DELTA = (-2)^2-(-1/5*1/3*4)
DELTA = 64/15
DELTA > 0
x = ((64/15)^(1/2)+2)/(1/3*2) or x = (2-(64/15)^(1/2))/(1/3*2)
x = 3/2*((64/15)^(1/2)+2) or x = 3/2*(2-(64/15)^(1/2))
x in { 3/2*(2-(64/15)^(1/2)), 3/2*((64/15)^(1/2)+2) }
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