Answer:
Step-by-step explanation:
We need to work backwards to solve this problem; starting with negative 7...
If you add 11 to a number, you get negative seven. Which means that the original number must be 11 less than negative 7.
-7 - 11 = -18
Now, 2 times a number equals -18... Well, what's -18 divided by 2?
-18 / 2 = -9
So, the original number must be -9!
To check your work, work forwards now.
-9 x 2 = -18 -18 + 11 = -7
