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Algebra
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Algebra is the area of mathematics where letters (like x or y) or other symbols are used to represent unknown numbers.
For example: in x - 5 = 2, x is unknown, but can be solved by adding 5 to both sides of the equal sign (=), like this:
x - 5 = 2
x - 5 + 5 = 2 + 5
x + 0 = 7
x = 7 (the answer)
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