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x in (-oo:+oo)
x^(2/3) = 36 // - 36
x^(2/3)-36 = 0
1*x^(2/3) = 36 // : 1
x^(2/3) = 36
x^(2/3) = 36 // ^ 3
x^2 = 46656 // ^ 1/2
abs(x) = 216
x = 216 or x = -216
x in { 216, -216 }
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