158688

First of all I solved the question and found that number 3 and 5 came to the name number when diving and subtracting.
After I wrote down the 2 same awnsers and tried to spot a pattern in the questions or if it followed a rule.
After finding a pattern I saw that the whole number at the front was 2 more than the denometer and 1 more than the number after the minus or the division symbol.
I have this theory in a photo on the file.
After spotting this pattern I tried a question which I made which followed the rule and again came to the same awnser😄