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Find number abc

If 3bb30 + 7abca = cca8aa find number abc. Multiple solutions may exist.

Correct answers: 2

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Concorde

In 1976, the Concorde began regular passenger service between Europe and Washington D.C., the first U.S. destination for transatlantic supersonic flights by Air France and British Airways. Scheduled Concorde flights started on 21 Jan 1976 for London-Bahrain and Paris-Rio routes. On 17 Dec 1975, the U.S. House of Representatives voted by 199 to 198 to put a six month ban on Concorde landings in the America, mainly due to citizens alarmed about sonic booms. The ban was lifted on 4 Feb 1976, but only allowed supersonic flight over the ocean. When on 3 Mar 1976, New York banned Concorde landings locally, Washington D.C. was chosen for the first route. New York finally conceded, and service to there began 22 Nov 1977.«

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