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An expression in mathematics is simply a statement - it is not equal to anything. For example,

x + 3 is an expression because we are not told what it is equal to, it is just a statement.

Expressions require variables (like x or y) in order to be of any interest to mathematicians. However, an expression in itself is rarely all that useful. We can simplify expressions or use arithmetic skills to rearrange them but we can not 'solve' them since there is no equals sign.

An equation, however, does have an equals sign and is very useful.

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Q: How do you do a math expression?
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