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(3/4)*x^18 = 5 // - 5
(3/4)*x^18-5 = 0
3/4*x^18 = 5 // : 3/4
x^18 = 20/3
x^18 = 20/3 // ^ 1/18
abs(x) = (20/3)^(1/18)
x = (20/3)^(1/18) or x = -(20/3)^(1/18)
x in { (20/3)^(1/18), -(20/3)^(1/18) }
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