Answer:
14x
Step-by-step explanation:
So what we need to do is distribute the 2 to the numbers in the parenthesis. You should get 6+14x+(-6). We then combine like-terms to fully simplify. We can't add 14x with the constants because they aren't like-terms. So 6-6 cancels out it entirely, so you'll be left with 14x.
