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When are two or more algebraic expressions equivalent?
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Algebraic expressions that have the same numerical values (answer) are called equivalent numerical expressions.

Algebraic expressions that have the same numerical value for all values of the numbers represented by letters are called equivalent expressions. Two algebraic expressions $2x + 3x$ and $5x$ are equivalent because they have the same values for any input variable $x$. We can write this using mathematical language and convention as $2x + 3x = 5x$ for all values of $x$.

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