Solve 57/20 < (((13)^(k+1) - 1)/((13)^k (12))) + (2/(((13)^(k+1) - 1)/((13)^k (12)))) < 47/16 for kSolve 57/20 < (((13)^(k+1) - 1)/((13)^k (12))) + (2/(((13)^(k+1) - 1)/((13)^k (12)))) < 47/16 for k

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