Let x represent the number then:
[tex]13=8x-19.[/tex]
Now, to solve for x, first, you add 19 to both sides of the equation:
[tex]\begin{gathered} 13+19=8x, \\ 32=8x. \end{gathered}[/tex]
Finally, dividing by 8, you get:
[tex]\begin{gathered} 8x=32, \\ x=\frac{32}{8}, \\ x=4. \end{gathered}[/tex]
Answer:
[tex]4.[/tex]
