
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
Read the following poem: "The great river flows east, washing away all the heroes of the past; At the age of standing tall, he became the governor of Dong Wu, but passed away at a young age with a two-digit number; The tens digit is exactly three less than the units digit, and the square of the units digit is equal to his age at death." The poem implies that Zhou Yu became the governor of Dong Wu at the age of thirty, and passed away at an age with two digits. The tens digit is $3$ less than the units digit, and the square of the units digit equals his age at death. If we denote the units digit of his age at death as $x$, then according to the poem, we can set up the equation ______.

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