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x in (-oo:+oo)
(2/3)*x^2 = 6 // - 6
(2/3)*x^2-6 = 0
2/3*x^2 = 6 // : 2/3
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in { 3, -3 }
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