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x in (-oo:+oo)
X/3-2 = (x/9)*x // - (x/9)*x
X/3-((x/9)*x)-2 = 0
X/3+(-1/9)*x^2-2 = 0
-1/9*x^2 = -(1/3*X-2) // : -1/9
x^2 = -9*(2-(1/3*X))
x^2 = -9*(2-1/3*X) // ^ 1/2
abs(x) = (-9)^(1/2)*(2-1/3*X)^(1/2)
x = (-9)^(1/2)*(2-1/3*X)^(1/2) or x = -((-9)^(1/2)*(2-1/3*X)^(1/2))
x in { (-9)^(1/2)*(2-1/3*X)^(1/2), -((-9)^(1/2)*(2-1/3*X)^(1/2)) }
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