Question

integer sum what should be added to -23 to get 9

Answer 1

Let the number that should be added to -23 to get 9 = x
Therefore
- 23 + x = 9
x = 9+ 23
x = 31.

The number is 31.

Answer 2

so we can tell it is x
so x+-23 =9 
so when 23 comes to 9 side it becomes 
+ so now 23 -9 =14 
14 is the answer