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