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x in (-oo:+oo)
x^(5/3) = 253 // - 253
x^(5/3)-253 = 0
1*x^(5/3) = 253 // : 1
x^(5/3) = 253
x^(5/3) = 253 // ^ 3
x^5 = 16194277 // ^ 1/5
x = 16194277^(1/5)
x = 16194277^(1/5)
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