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Math problems of the devil and the farmer (a quick glance)
Assuming that the farmer has money, he can do equations.

The money left after the first time is 2x-24.

The remaining money for the second time is 2(2x-24)-24.

The remaining money for the third time is 0=2(2(2x-24)-24)-24.

Solve the third equation to get x=2 1.

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