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2*x^(2/3)-5^(1/3)-3 = 0
2*x^(2/3) = 5^(1/3)+3 // : 2
x^(2/3) = (5^(1/3)+3)/2
x^(2/3) = (5^(1/3)+3)/2 // ^ 3
x^2 = ((5^(1/3)+3)^3)/8 // ^ 1/2
abs(x) = ((5^(1/3)+3)^(3/2))/(2*2^(1/2))
x = ((5^(1/3)+3)^(3/2))/(2*2^(1/2)) or x = -(((5^(1/3)+3)^(3/2))/(2*2^(1/2)))
x in { ((5^(1/3)+3)^(3/2))/(2*2^(1/2)), -(((5^(1/3)+3)^(3/2))/(2*2^(1/2))) }
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