Answer :

[tex]-8(3-s)=32 \ \ \ |:8 \\\\ -(3-s)=4 \\\\ -3+s=4 \\\\ s=4+3 \\\\ \boxed{s=7}[/tex]
[tex] -8(3-s)=32 \\ -24+8s=32\\ 8s=56\\ s=7[/tex]