
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
Anhui Province has accelerated the pace of "connecting county towns with expressways", realizing that "every county is connected" by expressways, which has effectively promoted the development of the county's economy. In just the past year, a total of 519 kilometers of new or expanded expressways were opened. The length of the newly built expressways is 45 kilometers less than twice the length of the expanded expressways. Find out how many kilometers of expressways were newly built and expanded last year.

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