
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
Given that $\{a_n\}$ is an arithmetic sequence with a common difference of $3$, and the sequence $\{b_n\}$ satisfies $(b_1=1, b_2=\frac{1}{3}, a_nb_{n+1}+b_{n+1}=nb_n)$.

1. Find the general term formula for $\{a_n\}$;
2. Find the sum of the first $n$ terms of $\{b_n\}$.

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