To **evaluate** an *expression*, just replace the unknowns with grouping symbols, insert the **value** for the unknowns, and do the arithmetic, making sure to follow the rules for the order of operations.

##### Example 1

Evaluate each of the following:

To **evaluate** an *expression*, just replace the unknowns with grouping symbols, insert the **value** for the unknowns, and do the arithmetic, making sure to follow the rules for the order of operations.

Evaluate each of the following:

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