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(x^5)/3 = 243 // - 243
(x^5)/3-243 = 0
1/3*x^5 = 243 // : 1/3
x^5 = 729
x^5 = 729 // ^ 1/5
x = 3*3^(1/5)
x = 3*3^(1/5)
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