\( 1 \leftarrow \) Translate into an equation. Do not solve. Use \( n \) to represent the unknown number. The difference between a number and three is eighteen.

The equation you are looking for is \( n - 3 = 18 \). It captures the essence of the problem, showing that when you take a number \( n \) and subtract 3 from it, you end up with 18. This type of equation is frequently encountered in real-life scenarios, such as budgeting or planning. For example, if you’re wondering how much more you need to save to reach a goal after spending a certain amount, you can set it up just like this! Just think of \( n \) as your targeted amount!