
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
A certain library charges for renting books as follows: for the first two days after renting a book, the charge is $0.6$ dollars per day, and after that, the charge is $0.3$ dollars per day. Then, the expression for the rent $y$ of a book after $x$ days $(x\geqslant 2)$ of renting is ______.

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