Find number abc
If 7a7bc - abb70 = 791c find number abc. Multiple solutions may exist.Correct answers: 20
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World's first rocket-propelled aircraft flightIn 1928, the world's first rocket-propelled aircraft flight was made over the Rhon Mountains, Germany. It was a tailless glider with two solid-fuel rockets, pioneered and developed by Alexander Martin Lippisch. |