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((21/2)*x^13)/5-(23/8) = 0
((21/2)*x^13)/5-23/8 = 0
21/10*x^13 = 23/8 // : 21/10
x^13 = 115/84
x^13 = 115/84 // ^ 1/13
x = (115/84)^(1/13)
x = (115/84)^(1/13)
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