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Answer the following work problem. Report your answer to the nearest tenth of a day.

Juan can do a certain job in 10 days. Thadeus can do the same job in 7 days. Juan and Thadeus work together to complete the same job. However, Juan starts working 5 days after Thadeus starts to work. How many days will it take for them to complete the job once Thadeus starts to work? days