
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
Three "mryak" are 10 rubles more expensive than five "bryak". Six "mryak" are 31 rubles more expensive than eight "bryak". By how many rubles are seven "mryak" more expensive than nine "bryak"?

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