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x in (-oo:+oo)
(2/3)/4 = x^6 // - x^6
(2/3)/4-x^6 = 0
-1*x^6 = -1/6 // : -1
x^6 = 1/6
x^6 = 1/6 // ^ 1/6
abs(x) = (1/6)^(1/6)
x = (1/6)^(1/6) or x = -(1/6)^(1/6)
x in { (1/6)^(1/6), -(1/6)^(1/6) }
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