
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
Let $A=3^{7}+\binom{7}{2}3^{5}+\binom{7}{4}3^{3}+\binom{7}{6}3$, $B=\binom{7}{1}3^{6}+\binom{7}{3}3^{4}+\binom{7}{5}3^{2}+1$. Find $A-B$.

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