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An equation means an expression with an equal sign in it (=), and that makes sense. For example 4 + 3 = 7 is an equation, while 4 + 3 = 6 or 4 + 5 are not equations. The first one is incorrect, while the second one is an expression.

The word equation describes a statement that two sets of something are equal to one another.

In mathematics, the two sets can consist of numbers, letters, or symbols.

In chemistry, an equation describes - in symbols - the changes that take place in a chemical reaction.

In everyday usage, an equation suggests one or more things are equal to one or more other things, or describe the varying aspects which need to be taken into consideration when analyzing a situation.

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Q: In math what does the word equation mean?
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