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Riddle: 24 from Spare Parts

Using only and all the numbers 3, 3, 7, 7, along with the arithmetic operations +,-,*, and /, can you come up with a calculation that gives the number 24? No decimal points allowed.

[For example, to get the number 14, we could do 3 * (7 - (7 / 3))]

This just takes patience...keep trying.

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