Answer:
-9n + 3
Explanation:
When you are subtracting something, their signs switch. What that means is the 2n would become -2n and the -1 would become 1. Once you switch the signs, you can add them together.
-7n + 2 - (2n - 1)
-7n + 2 - 2n + 1
Then you add the common numbers
-9n + 3
