
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
Simplify the following expression in $x$: \[3x + 10x^2 + 5x^3 + 15 - (7 - 3x - 10x^2 - 5x^3).\] Express your answer in the form $ax^3 + bx^2 + cx + d$, where $a$, $b$, $c$, and $d$ are numbers.

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