The equation given is,
[tex]9x+10=13[/tex]Solving for x
Subtract 10 from both sides
[tex]\begin{gathered} 9x+10-10=13-10 \\ 9x=3 \end{gathered}[/tex]Divide both sides by 9
[tex]\begin{gathered} \frac{9x}{9}=\frac{3}{9} \\ x=\frac{1}{3} \end{gathered}[/tex]Hence,
[tex]x=\frac{1}{3}[/tex]