
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 the sequence ${a_n}$ with the sum of its first $n$ terms $S_n = \frac{3}{2}n^2 - \frac{123}{2}n$, where $n \in \mathbb{N}^*$.
(1) Find the general term formula $a_n$ of the sequence ${a_n}$.
(2) Find the value of $T_n = |a_1| + |a_2| + ... + |a_n|$.

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