
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
Given that person A departed from Chang'an and arrived in Qi after 5 days, and person B departed from Qi and arrived in Chang'an after 7 days, and when person B had already departed two days earlier, person A was still departing from Chang'an, set up an equation to find the number of days it will take for person A and person B to meet.

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