The number 25, divide that by 5 will be 5 now subtract that 25 with 20, the answer will be 5, now a random 20 appeared, add the 2 5’s and that will become 10, not subtract that 10 with the 20, you get 10. Now add all the numbers you see in the screen, the answer is 142, not subtract that with 137, that will be 5... I just wasted your time.