
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
At the beginning of the year $2018$, the price of a property in a certain real estate development was $20000$ yuan per square meter. After two consecutive years of price reductions, the price at the beginning of $2020$ was $16200$ yuan. Let $x$ be the average annual percentage decrease in price over these two years. The equation based on the given conditions is ____.

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