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An expression is a collection of mathematical terms, connected by mathematical binary operations (such as +, - , * , /).

An inequality is a comparison between two expressions.

For example,

x2 + 3x/4y - 2xy + 7 and

3x + sin(x)*ex - 29/x + sqrt(x+y3) - 4y/27, where x is not 0

are expressions in two variables, x and y.

x2 + y < 4x is an inequality

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Q: What is the difference between expression and an inequality?
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