
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
A construction team plans to build a tunnel with a length of 1280 meters. In the first week, they build at the original planned speed. One week later, they build at a speed 1.4 times the original speed. As a result, they complete the task two weeks ahead of schedule. If the original plan was to build x meters of the tunnel per week, determine the equation that describes this situation.

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