Where are the sets? I don't see any...
Answer:

Step-by-step explanation:
Whenever we have 2 fractions equal to each other, we first cross multiply, then take variables to one side and numbers to other side and use basic algebra to solve for the variable [here, it is x].
The process is shown below:

So, x = 3/4
I believe (a+b)^5 would be the answer
I suggest you to go watch this video
https://www.youtube.com/watch?v=3W8SeYgZcMo
and you could also use the prime factorization method
where u list all the prime factorization for every number and find the common one