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x in (-oo:+oo)
x^(4/3) = 1296 // - 1296
x^(4/3)-1296 = 0
1*x^(4/3) = 1296 // : 1
x^(4/3) = 1296
x^(4/3) = 1296 // ^ 3
x^4 = 2176782336 // ^ 1/4
abs(x) = 216
x = 216 or x = -216
x in { 216, -216 }
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