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(1/3)*x^4-(5/3) = 0
(1/3)*x^4-5/3 = 0
1/3*x^4 = 5/3 // : 1/3
x^4 = 5
x^4 = 5 // ^ 1/4
abs(x) = 5^(1/4)
x = 5^(1/4) or x = -5^(1/4)
x in { 5^(1/4), -5^(1/4) }
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