If I have:
I color coded the like terms. Like Terms means that the terms are the same (terms are the variables and/or exponents that are behind the numbers (coefficients)
In the following example I am going to show you how to combine like terms in order to simplify the expressions. PLEASE REMEMBER THAT SIMPLIFY DOES NOT ALWAYS MEAN YOU WILL GET A FINAL ANSWER.
I color coded the like terms again just to show you what I combined. Notice that I did not get a final numeric answer. There is nothing else that can be done to this expression, this is as simplified as it can get.
FOR MORE PRACTICE ON IDENTIFYING LIKE TERMS CHECK OUT THIS GAME