I don't see any green dot, sorry.
Answer:
Just guessing here but would the bottom be 4,8,12,16,20 maybe since it is going by 4 then you do the same for the top since it is going by 3
Step-by-step explanation:
They both (36 and 45) go into 9. Divide them both by 9.
The answer is to your question is x=-6