### Explanation: Let's say the number you pick is x. You are told to multiply it by two - this gives 2x. Then, you add 6, which gives you 2x+6, or 2(x+3), as 2 is a common factor. Then you divide it by 2, which gives you x+3. Finally, you are told to minus your first number, which is x, which leaves you with 3. (Sorry to be weird://)