Was this done correctly? i still can't grasp this concept completely and i feel like i did something wrong here. any is greatly appreciated!

What you have done is correct but i think its better to write the 2 roots separately a I mentioned in a previous question

answer: there are x+184 pages in olivia's book.

step-by-step explanation:

let the total number of pages in the book which olive has already read be x.

then if olive has 184 pages left to read, then the total number of pages are in olive's book= pages she has read+pages she has left to read

therefore, the total number of pages in olivia's book=

hence, there are x+184 pages in olivia's book.