Solve 57/20 < ((57(5^(2k)) - 2(5^(k+1)) + 1)/(4(5^(2k+1)) - 4(5^k))) <= 43/15 for kSolve 57/20 < ((57(5^(2k)) - 2(5^(k+1)) + 1)/(4(5^(2k+1)) - 4(5^k))) <= 43/15 for k

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