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Find number abc

If 7a7bc - abb70 = 791c find number abc. Multiple solutions may exist.

Correct answers: 20

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Wrong Answer

My wife asked me what my favorite time to have sex was?
Apparently "when you're at work" was the wrong answer.

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Radio patent

In 1914, a U.S. patent was issued to Edwin H. Armstrong for a “Wireless Receiving System” which described his famous regenerative, or feed-back, circuit (No. 1,113,149). This invention started Armstrong's career of innovation. He went on to become a pioneer in FM radio broadasting.«

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