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Find number abc

If 7b2c3 - ac210 = 1a083 find number abc. Multiple solutions may exist.

Correct answers: 2

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The Alphabet

I’m trying to learn the alphabet but I can’t get past X.
I don’t know why.

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Air photo

In 1911, the first photograph to be taken in the U.S. from an airplane was made. The photographer was Major H.A. "Jimmie" Erickson while flying in a Curtiss biplane piloted by Charles Hamilton over San Diego, California.[Image: a different pilot and Curtiss Pusher aircraft showing the flyer's conditions in 1911. Inset: a typical box camera of the era, a Kodak No.2 Bullseye.]

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