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(2/5)^8*x = (25/4)^2 // - (25/4)^2
(2/5)^8*x-(25/4)^2 = 0
256/390625*x-625/16 = 0 // + 625/16
256/390625*x = 625/16 // : 256/390625
x = 625/16/256/390625
x = 244140625/4096
x = 244140625/4096
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