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(x/6)*x^12-20 = 64 // - 64
(x/6)*x^12-64-20 = 0
1/6*x^13 = 84 // : 1/6
x^13 = 504
x^13 = 504 // ^ 1/13
x = 504^(1/13)
x = 504^(1/13)
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