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x in (-oo:+oo)
x^(2/5) = 11 // - 11
x^(2/5)-11 = 0
1*x^(2/5) = 11 // : 1
x^(2/5) = 11
x^(2/5) = 11 // ^ 5
x^2 = 161051 // ^ 1/2
abs(x) = 121*11^(1/2)
x = 121*11^(1/2) or x = -(121*11^(1/2))
x in { 121*11^(1/2), -(121*11^(1/2)) }
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