Which branch of mathematics uses symbols to represent unknown quantities?

Which branch of mathematics uses symbols to represent unknown quantities?
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Algebra
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If you had to answer why the axioms of logic and mathematics are the way they are, what would you say?

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What are my options for studying mathematics online?

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Mathematics question: What is the correct answer?

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What do you think is the most mind-blowing concept in mathematics?

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Would aliens really understand our mathematics?

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