
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
The resource of "water", once thought to be inexhaustible, has reached a degree where it severely constrains China's economic development and seriously affects people's lives. Due to water shortages, annual losses to China's industry reach 2000 billion yuan, losses to agriculture reach 1500 billion yuan, and two-thirds of cities nationwide suffer from severe water shortages. To save water, a city plans to implement a water fee policy. The policy stipulates that if the water usage per person per quarter does not exceed 5 tons, the water fee is 1.2 yuan per ton. If the usage exceeds 5 tons but does not exceed 6 tons, the fee for the excess part will be increased by 200%. If the usage exceeds 6 tons but does not exceed 7 tons, the fee for the excess part will be increased by 400%. If a person's actual water usage this quarter is x (x≤7) tons, the water fee to be paid is f(x).
(1) Try to find the analytical expression of the function f(x);
(2) If he paid 12.6 yuan this quarter, how many tons of water did he actually use?

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