For this case we have the followig number given -6
And we want to find which number we can add to this number in order to still have a negative non zero number. And for this case we can set up the following equation:
![-6+x=-1](https://img.qammunity.org/2023/formulas/mathematics/college/2uahoin9rz0qnzmmh30hoeacwg63323eku.png)
And solving for x we got:
![x=-1+6=5](https://img.qammunity.org/2023/formulas/mathematics/college/h7lrqdfyi7atbdlgm9449h4ikdtig0n524.png)
And then the answer for this case would be 5