
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
A person takes the train to work in the morning, and the train home in the afternoon, or takes the train to work in the afternoon and the car home in the morning. Over x days, this person took the train 9 times, took the car in the morning 8 times, and took the car in the afternoon 15 times. Determine the value of x.

Present the answer in LaTex format: \boxed{Your answer}
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