
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 $m$ and $n$ are opposites, $a$ and $b$ are negative reciprocals, and the absolute value of $x$ equals 3, then the value of the expression $x^3 - (1+m+n+ab)x^2 + (m+n)x^{2004} + (ab)^{2005}$ equals to.

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