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x in (-oo:+oo)
X^2-((1/3)*x)-(2/3) = 0
X^2+(-1/3)*x-2/3 = 0
X^2-1/3*x-2/3 = 0 // - X^2-2/3
-1/3*x = -(X^2-2/3) // : -1/3
x = (-(X^2-2/3))/(-1/3)
x = -3*(2/3-X^2)
x = -3*(2/3-X^2)
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