
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
Li Gang delivered honeycomb briquettes to Grandma Wang, a dependent of a military personnel. The first time, he delivered $\frac{3}{8}$ of the total. The second time, he delivered 50 pieces. At this point, the amount delivered was exactly $\frac{5}{7}$ of the amount not yet delivered. How many pieces of honeycomb briquettes have not been delivered yet?

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