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x in (-oo:+oo)
x^(4/3) = 8/27 // - 8/27
x^(4/3)-(8/27) = 0
x^(4/3)-8/27 = 0
1*x^(4/3) = 8/27 // : 1
x^(4/3) = 8/27
x^(4/3) = 8/27 // ^ 3
x^4 = 512/19683 // ^ 1/4
abs(x) = (512/19683)^(1/4)
x = (512/19683)^(1/4) or x = -(512/19683)^(1/4)
x in { (512/19683)^(1/4), -(512/19683)^(1/4) }
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