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x in (-oo:+oo)
4*x^(2/3) = 36 // - 36
4*x^(2/3)-36 = 0
4*x^(2/3) = 36 // : 4
x^(2/3) = 9
x^(2/3) = 9 // ^ 3
x^2 = 729 // ^ 1/2
abs(x) = 27
x = 27 or x = -27
x in { 27, -27 }
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