There are eight numbers in a row, and their average is 9.3. It is known that the average of the first five numbers is 10.5, and the average of the last two numbers is 9.3. What is the sixth number?

9.3 × 8-10.5 × 5-9.3 × 2 = 74.4-52.5-18.6 = 21.9-18.6 = 3.3

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