When you combine like terms, you essentially add things that are similar, like integers or variables. Here, we have 2 integers and 1 variable. We will add the two integers and leave the 1 variable as it has no like terms to be added with.
So we have -12 -6p -(-2). When we have -(-n), that makes +n; when there is a minus sign in front of brackets, that flips the sign of everything inside the brackets — -(-2) becomes +2.
So now, we have -12-6p+2. We add -12 and +2 and get -10. So our expression looks like this: -10-6p, and thats it.
