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