
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
If the lines \( l_{1}: a x + (1-a) y = 3 \) and \( l_{2}: (a-1) x + (2a+3) y = 2 \) are perpendicular to each other, determine the value of \( a \).

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