
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
\[
\frac{\frac{a-b}{2a-b} - \frac{a^{2}+b^{2}+a}{2a^{2}+ab-b^{2}}}{\left(4b^{4} + 4ab^{2} + a^{2}\right) : \left(2b^{2} + a\right)} \cdot \left(b^{2} + b + ab + a\right)
\]

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