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x in (-oo:+oo)
x^(2/3) = 54 // - 54
x^(2/3)-54 = 0
1*x^(2/3) = 54 // : 1
x^(2/3) = 54
x^(2/3) = 54 // ^ 3
x^2 = 157464 // ^ 1/2
abs(x) = 162*6^(1/2)
x = 162*6^(1/2) or x = -(162*6^(1/2))
x in { 162*6^(1/2), -(162*6^(1/2)) }
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