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x in (-oo:+oo)
2/3 = x^12 // - x^12
2/3-x^12 = 0
-1*x^12 = -2/3 // : -1
x^12 = 2/3
x^12 = 2/3 // ^ 1/12
abs(x) = (2/3)^(1/12)
x = (2/3)^(1/12) or x = -(2/3)^(1/12)
x in { (2/3)^(1/12), -(2/3)^(1/12) }
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