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x in (-oo:+oo)
(2/3)*x^2-1 = 15 // - 15
(2/3)*x^2-15-1 = 0
2/3*x^2 = 16 // : 2/3
x^2 = 24
x^2 = 24 // ^ 1/2
abs(x) = 2*6^(1/2)
x = 2*6^(1/2) or x = -(2*6^(1/2))
x in { 2*6^(1/2), -(2*6^(1/2)) }
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