ok. The original problem:

now, you are to combine like terms. This means to combine the terms that have the same variables being multiplied to each other. Look at you will combine this with because they both have everything exactly the same, except for the coefficient(the number). so, you will get , and you do this for the whole problem to get:

YAY

Once again, you are adding and subtracting the numbers that have the same variable ending, simply put.