
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 Teacher Zhang has a batch of picture books to distribute to several children, and if every $3$ children receive one book, there will be $2$ books left, and if every $2$ children receive one book, there will be $9$ children who have not received a book, write the equation to represent the number of children.

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