maths

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algebra expressions 

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Expressions

In algebra, letters are used to stand for values that can change (variables) or for values that are not known (unknowns).

A term is a number or letter on its own, or numbers and letters multiplied together, such as - 2, 3x or 5a^2.

An expression is a set of terms combined using the operations +, – , x or  \div, for example 4x − 3 or x^2 – xy + 17.

An equation states that two expressions are equal in value,

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