1. Combine like terms. The like terms in this problem are 2n and 3n. This means you have to add them together. 2n + 3n = 5n. Now put the +5 at the end of the problem since you can't simplify 5n + 5 any further. Your answer will be:
5n + 5.
2. Again, combine like terms first. The like terms in this problem are x and -4x. Since the 4x is negative, you have to subtract 4x from x. It will look like this: x - 4x = -3x. Now put the -7 at the end of the problem since you can't simplify -3x - 7 any further. Your answer should be:
-3x - 7
I hope that helps :)