Solve 57/20 < ((5^(k+1) - 1)/(5^k (4))) + (2/((5^(k+1) - 1)/(5^k (4)))) < 47/16 for kSolve 57/20 < ((5^(k+1) - 1)/(5^k (4))) + (2/((5^(k+1) - 1)/(5^k (4)))) < 47/16 for k

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