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(1/2)*x^13 = 9 // - 9
(1/2)*x^13-9 = 0
1/2*x^13 = 9 // : 1/2
x^13 = 18
x^13 = 18 // ^ 1/13
x = 18^(1/13)
x = 18^(1/13)
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