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Find number abc

If cc5aa - a5a97 = 29bac find number abc. Multiple solutions may exist.

Correct answers: 56

The first user who solved this task is Ordinacija Aleksic.

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Mailbox patent

In 1942, L.A. Thatcher of Stamford, CT received a patent this day - by mail. Appropriately, Mr. Thatcher had patented a coin-operated mailbox. When money was inserted, a meter stamped the envelope.

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