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x in (-oo:+oo)
(2*x^2)/3 = 18 // - 18
(2*x^2)/3-18 = 0
2/3*x^2 = 18 // : 2/3
x^2 = 27
x^2 = 27 // ^ 1/2
abs(x) = 3*3^(1/2)
x = 3*3^(1/2) or x = -(3*3^(1/2))
x in { 3*3^(1/2), -(3*3^(1/2)) }
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