
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
Let S<sub>n</sub> be the sum of the first n terms of the sequence {a<sub>n</sub>}. If the point (n, a<sub>n</sub>) (n ∈ N*) lies on the line y = 2x, then a<sub>n</sub> + S<sub>n</sub> equals \_\_\_\_\_\_.

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