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(x/5)*x^20 = 12 // - 12
(x/5)*x^20-12 = 0
1/5*x^21 = 12 // : 1/5
x^21 = 60
x^21 = 60 // ^ 1/21
x = 60^(1/21)
x = 60^(1/21)
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