Respuesta :

s = 8

Explanation:

19=s/2+15​

collect like terms:

19 - 15 = s/2

4 = s/2

[tex]\begin{gathered} 4\text{ =}\frac{s}{2} \\ \text{cross multiply} \\ s\text{ = 4}\times2 \\ s\text{ = 8} \end{gathered}[/tex]