You have the following equation:
[tex]-13v-8=5[/tex]So first you must solve for the variable "v", because you need to know its value. This is:
[tex]\begin{gathered} -13v-8=5 \\ -13v=5+8 \\ -13v=13 \\ v=\frac{13}{-13} \\ v=-1 \end{gathered}[/tex]Sinve you need to find the value of this expression:
[tex]4v-3[/tex]You just need to substitute the value of "v" calculated above, into the expression and the evaluate. You get that its value is:
[tex]4v-3=4(-1)-3=-4-3=-7[/tex]