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Find number abc

If 2aac8 - 21b3a = b111 find number abc. Multiple solutions may exist.

Correct answers: 28

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

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In 1783, the first hot-air balloon ascent - unmanned - flew for ten minutes. It was made by the French brothers Joseph-Michel and Jacques-Étienne Montgolfier at their home town of Annonay, France.

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