Algebra

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

For example: x + 3 = 7
"x" is unknown (often called the "variable").

In this case the value of "x" can be found by subtracting 3 from both sides of the equal sign like this:

Start with: x + 3 = 7
Subtract 3 from both sides: x + 3 - 3 = 7 - 3
Calculate: x + 0 = 4
Answer: x = 4