Answer :
So you put -4.6 in where s is:
-4.6-11.5
Then I see that your subtracting so its going to be an even smaller negative solution:
-4.6-11.5=-16.1
You can check by taking -16.1 and adding 11.5 you get s which is -4.6
:D
[tex]\rm s=-4.6 \\ -4.6-11.5=-(4.6+11.5) \\ \\
11.50+ \\
\underline{~~4.60} \\ 16.10 \\ \\ \boxed{\bold{Answer:-16.10}}[/tex]