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x in (-oo:+oo)
y = 6*x^2-(1/6) // - 6*x^2-(1/6)
y-(6*x^2)+1/6 = 0
y-6*x^2+1/6 = 0
-6*x^2 = -(y+1/6) // : -6
x^2 = (y+1/6)/6
x^2 = (y+1/6)/6 // ^ 1/2
abs(x) = ((y+1/6)^(1/2))/(6^(1/2))
x = ((y+1/6)^(1/2))/(6^(1/2)) or x = -(((y+1/6)^(1/2))/(6^(1/2)))
x in { ((y+1/6)^(1/2))/(6^(1/2)), -(((y+1/6)^(1/2))/(6^(1/2))) }
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