
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
In a box, there are several black and white pieces. If one black piece is taken out, the remaining ratio of black pieces to white pieces is $9: 7$. If the black piece is put back and a white piece is taken out instead, the remaining ratio of black pieces to white pieces is $7: 5$. Determine how many more black pieces were there originally compared to white pieces.

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