Answer:
12
Explanation:
There are 28 spaces between -2 and 26. You only have 3 actual numbers between them. If you subtract 26 by 7 four times(since you are also counting the number -2) you get -2. Therefore, if you subtract 7 from 26 two times, you get the third number, which is 12.
It's a little complicated, but if you work it out, it makes sense