
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
Combine like terms:  
(1) Simplify and evaluate: $x^2+4x-(2x^2-x+x^2)-(3x-1)$, where $x=-3$.  
(2) Find the value of the algebraic expression $2[mn+(-3m)]-3(2n-mn)$, given that $m+n=2$ and $mn=-3$.

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