
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
Given the function $f(x) = ax^2 + bx + c$ $(a, b, c \in \mathbb{R})$, if there exists a real number $a \in [1,2]$ such that for any $x \in [1,2]$, $f(x) \leqslant 1$, then the maximum value of $7b+5c$ is \_\_\_\_.

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