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It is an expression and if it contains an equality sign then it is an equation.
A numerical expression is a mathematical phrase involving only numbers and one or more operational symbols. The following are some examples of numerical expressions. For example, the numerical expression 4 + 20 - 7 in the example above simplifies to the number 17.
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A numerical expression in math terms has numbers and operations like for an example 1. 4+9 2. (8-2)+5
an equation