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Find number abc

If 3c3ab + 32bc4 = a28a9 find number abc. Multiple solutions may exist.

Correct answers: 28

The first user who solved this task is Nasrin 24 T.

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I have a smart phone with a dumb battery.

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Water bicycle

In 1869, the first U.S. patent for a "water velocipede" was granted to F.A. Spofford and Matthew G. Raffington of Columbus, Ohio (No. 95,531). A number of similar devices were patented by the end of the nineteenth century.

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