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x in (-oo:+oo)
x^(4/3) = 7/3 // - 7/3
x^(4/3)-(7/3) = 0
x^(4/3)-7/3 = 0
1*x^(4/3) = 7/3 // : 1
x^(4/3) = 7/3
x^(4/3) = 7/3 // ^ 3
x^4 = 343/27 // ^ 1/4
abs(x) = (343/27)^(1/4)
x = (343/27)^(1/4) or x = -(343/27)^(1/4)
x in { (343/27)^(1/4), -(343/27)^(1/4) }
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