Answer:
Step-by-step explanation:
All you have to do is do the problem backwards.
For example, if your number is 1 then you add 4, double that, subtract 7, and you will get 3.
All the computer has to do is do the problem backwards.
3+7 (opposite of −7) is 10.
10÷2 (opposite of ×2) is 5.
−4 (opposite of +4) is 1, which was my original number.
