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Write an algebraic expression for the sum of a number and 15

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The algebraic expression for the sum of a number and 15 can be written as:

x + 15

where 'x' represents the number being added to 15.

To explain this expression, we need to understand the concept of variables in algebra. In algebra, variables are symbols used to represent unknown values or quantities. In this case, 'x' is the variable representing the unknown number that is being added to 15.

The '+' symbol represents the operation of addition, which combines two or more values to form a single value. In this case, the operation is between 'x' and 15, indicating that we are adding the unknown number 'x' to 15.

Therefore, the algebraic expression x + 15 represents the sum of a number and 15, where 'x' is the unknown number being added to 15.