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(X^1)/3-(2*x^2)-6 = 0
X/3-2*x^2-6 = 0
-2*x^2 = -(1/3*X-6) // : -2
x^2 = (6-(1/3*X))/(-2)
x^2 = (6-1/3*X)/(-2) // ^ 1/2
abs(x) = ((6-1/3*X)^(1/2))/((-2)^(1/2))
x = ((6-1/3*X)^(1/2))/((-2)^(1/2)) or x = -(((6-1/3*X)^(1/2))/((-2)^(1/2)))
x in { ((6-1/3*X)^(1/2))/((-2)^(1/2)), -(((6-1/3*X)^(1/2))/((-2)^(1/2))) }
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