Hi there!
Let's start by looking at our like terms:
12 and 7
2v and 7v
13v^3 and 13v^3
Since all of those terms are like each other, they can be added together. The terms that are being cubed can only be added to other terms being cubed because otherwise things would be a bit messed up. Here's what we can add together:
12 + 7 = 19
2v + 7v = 9v
13v^3 + 13v^3 = 26v^3
Now, we need to organize the terms in the expression like this - variable and cubed, just a variable, number. Using that our expression ends up being:
26v^3 + 9v + 19
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!
