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x in (-oo:+oo)
(2/3)*x^2 = 48 // - 48
(2/3)*x^2-48 = 0
2/3*x^2 = 48 // : 2/3
x^2 = 72
x^2 = 72 // ^ 1/2
abs(x) = 6*2^(1/2)
x = 6*2^(1/2) or x = -(6*2^(1/2))
x in { 6*2^(1/2), -(6*2^(1/2)) }
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