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Find number abc

If aacb8 - ca30c = 399ba find number abc. Multiple solutions may exist.

Correct answers: 49

The first user who solved this task is Nílton Corrêa De Sousa.

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First Latimer patent

In 1874, Lewis H. Latimer received his first U.S. patent (No. 147,363). This one was for his invention of a water-closed for railroad cars, but he is better known for his patents for improvement in incandescent electric lamps.«

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