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x=(5/7)^-5×(7/5)^-7
(7×7×7×7×7/5×5×5×5×5)×(5^5×5^2/7^5×7^2)
25/49 =0.510204
2x+1=2×0.510204+1
1.0204+1
2.0204
(7×7×7×7×7/5×5×5×5×5)×(5^5×5^2/7^5×7^2)
25/49 =0.510204
2x+1=2×0.510204+1
1.0204+1
2.0204
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