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