Answer:
3n+3
Explanation:
First, we can see that there is a "-" sign before the values in parenthesis. This means there is an "invisible" 1 there, so we have to distribute this -1 to all numbers in parenthesis, or in simple terms, we have to flip the signs of the numbers in parenthesis.
7n - 4n + 3
We can combine like terms, 7n and -4n to get 3n.
3n + 3
This is the answer, hope this helps! :)