Based on the observed in the picture, you can notice that:
[tex]m\angle JKL=m\angle JKM+m\angle MKL[/tex]
Knowing that:
[tex]\begin{gathered} $m\angle JKL=127\degree$ \\ \\ m\angle JKM=(9x-10)\degree \\ m\angle MKL=83\degree \end{gathered}[/tex]
You can substitute values into the equation and then solve for "x". You get that its value is:
[tex]\begin{gathered} 127=(9x-10)+83 \\ 127-73=9x \\ 54=9x \\ x=\frac{54}{9} \\ x=6 \end{gathered}[/tex]
