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(X/5)*x^11 = 1/15 // - 1/15
(X/5)*x^11-(1/15) = 0
(X/5)*x^11-1/15 = 0
1/5*X*x^11 = 1/15 // : 1/5*X
x^11 = 1/3*X^-1
x^11 = 1/3*X^-1 // ^ 1/11
x = (1/3)^(1/11)*X^(-1/11)
x = (1/3)^(1/11)*X^(-1/11)
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