
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
The general term formula of the sequence \\(\{a_n\}\) is \\(a_n=(-1)^n(3n-2)\\), where \\(n \in \mathbb{N}^*\), and \\(S_n\\) is the sum of the first \\(n\\) terms of the sequence \\(\{a_n\}\). What is the value of \\(S_{20} + S_{35}\\)?

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