Answer: 2x.
We are asked to solve the following:

This case involves both distribution and the combining of like terms, respectively.
- Distribute "2" among the variables in the parentheses to arrive at our new expression of:

- Combine the like terms 2y and - 2y. Our new expression looks like this:

- Since there are no other like terms, we are left with the final answer of: 2x.