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x in (-oo:+oo)
4*x^(2/3)-16 = 0
4*x^(2/3) = 16 // : 4
x^(2/3) = 4
x^(2/3) = 4 // ^ 3
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
x in { 8, -8 }
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