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It is a part of mathematics in which letters and other general  symbols are used to represent numbers and quantities in formulas and equations.
example : 2x -  3y = 10z

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The Brainliest Answer!
Algebra uses letters (like x or y) or other symbols in place of unknown values.

For example: x + 3 = 7
 here , "x" is unknown (often called the "variable").
so, x = 7-3
thus the value of x is 4.
got it?

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