
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
On seven tests, each out of 100 marks, Siobhan received marks of 69, 53, 69, 71, 78, x, and y. If her average mark on the seven tests is 66, then find the minimum possible value of x.

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