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x in (-oo:+oo)
4*x^(2/3)-256 = 0
4*x^(2/3) = 256 // : 4
x^(2/3) = 64
x^(2/3) = 64 // ^ 3
x^2 = 262144 // ^ 1/2
abs(x) = 512
x = 512 or x = -512
x in { 512, -512 }
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