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Google doubles as a calculator. Just type in your equation eg 5*7+3 and hit Search and it will return the answer.
What's even more powerful is that it includes constants eg "pi", "radius of earth" or "answer to life the universe and everything".
So to find how fast is Earth moving around the sun?
Search for: "square root of (mass of sun times gravitational constant divided by 1 au) in kilometres per second"
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