8a + 8b - 2a
8a and 2a are like terms.
Note: always remember to include the sign in front of a term (if there is no sign, then it is a plus). Here, it’s:
+8a -2a = 6a
8b is not a like term with 6a, because b and a are unable to be added together/multiplied.
So, the answer is:
6a + 8b
Or
8b + 6a
