From the diagram we know that:
[tex]\begin{gathered} TR=RV \\ TS=\text{VS} \end{gathered}[/tex]Therefore:
[tex]6x-3=39[/tex]Solving for x we get:
[tex]\begin{gathered} 6x=42 \\ x=7 \end{gathered}[/tex]Then:
[tex]\begin{gathered} TV=TR+RV=2RV=2(2x+5)=2(2\cdot7+5) \\ TV=2(19)=38 \end{gathered}[/tex]Answer: 38 units.