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Find number abc

If aa2ba - c87b1 = 550c find number abc. Multiple solutions may exist.

Correct answers: 4

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What's your job?

Me: What's your job?
Him: I'm an assassin.
Me: Good pay?
Him: I make a killing!

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Shutter patent

In 1883, black American inventor J. Cooper was issued a patent for his invention, "Shutter and Fastening" (No. 276,563). In the next few years, he also patented elevator devices.

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