
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
Fill the numbers from 1 to 9 into the grid shown in the diagram. Each cell must contain a unique integer, and the sum of the numbers in the surrounding cells (those sharing a common edge with the given cell) must be an integer multiple of the number in that cell. Given that the left and right cells are already filled with the numbers 4 and 5, respectively, what is the maximum possible number that can be placed in the cell marked with the letter $x$?

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