- 9 + 8y + 12 – ( - 2y) + 1 ?

Step-by-step explanation:

We begin with the given equation

First, we need to remove the parenthesis. Subtracting a negative value is the same as adding, so we can rewrite this as

Now, we need to add like terms. This means that we need to add the regular numbers together and then all of the numbers with y together

And there is our simplified expression