Magic Number

Which one(s) is/are magic number equations?

1. Think of a number. Add 4. Double your answer. Subtract 5. Now subtract two times your original number.
2. Think of a number. Add 6. Triple your answer. Subtract 7. Now subtract three times your original number.
3. Think of a number. Add 5. Quadruple your answer. Subtract 6. Now subtract four times your original number.

Now create and post your own in the comments section.