5. For the reaction of isomerization of B-hydroxycrotonic ether into acetoacetic ester at 25 C, the concentration of the starting substance was taken as 1.366 mol/l. After 71.8 hours, its concentration became 0.277 mol/l. Find the rate constants of the forward and reverse reactions if the final, no longer changing, concentration has become 0.078 mol / l.

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