Answer:
r = k+s/ 3
Step-by-step explanation:
[tex]K = 3r-5[/tex]
[tex]K+s= 3r[/tex]
[tex]\frac{k+s}{3}= r[/tex]
therefore, r=k+s/3
[tex]3r-s=K\qquad\text{add s to both sides}\\\\3r=K+s\qquad\text{divide both sides by 3}\\\\\boxed{r=\dfrac{K+s}{3}}[/tex]
