
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 $a_1 = 25$ and $a_4 = 16$,
(1) Find the general term of $\{a_n\}$;
(2) From which term onwards does the sequence $\{a_n\}$ become negative?
(3) Calculate the value of $|a_1| + |a_2| + |a_3| + \ldots + |a_n|$.

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