What is the missing value?

Answer:
1
Step-by-step explanation:
1 : -7
2 : -5 ( -7 + 2 )
3 : -3 ( -5 + 2 )
4 : -1 ( -3 + 2 )
5 : 1 ( -1 + 2 )
Hopefully this helps!
Brainliest please?