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x in (-oo:+oo)
(2/3)*x^2 = 150 // - 150
(2/3)*x^2-150 = 0
2/3*x^2 = 150 // : 2/3
x^2 = 225
x^2 = 225 // ^ 1/2
abs(x) = 15
x = 15 or x = -15
x in { 15, -15 }
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