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Find number abc

If a7c9c + bacb7 = 939b1 find number abc. Multiple solutions may exist.

Correct answers: 25

The first user who solved this task is Nasrin 24 T.

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Black American patent

In 1960, black American inventor, F. M. Jones was issued a U.S. patent for a "Thermostat and Temperature Control System" (No. 2,926,005).

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