
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 expression $\left(4a^{{\,\,\!\frac{2}{3}}} \cdot b^{{\,\,\!\-\frac{1}{3}}} \div\left(\begin{matrix}-\frac{2}{3}a\begin{matrix}^{-\frac{1}{3}}\\\\\,\\\\\\\end{matrix}b^{\frac{2}{3}}\\\end{matrix}\right)\right)$ and find the result.

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