Given the sentence "The difference of a number x and 2 is 7", you need to remember the following:
- A Difference is the result of a Subtraction.
- The verb "is" indicates that it is an equation. Therefore, you must use this symbol:
Knowing that you can write the following expression to represent the Difference mentioned in the exercise:
Finally, knowing this expression, you can write the following equation to represent the description given in the exercise:
Hence, the answer is: