Answer :
We know that the summ of all angles should be equal to 360 so:
[tex]55+8x+69+19x-9+12x+50=360[/tex]and we solve for x so:
[tex]\begin{gathered} 39x=360-165 \\ x=\frac{195}{39} \\ x=5 \end{gathered}[/tex]
We know that the summ of all angles should be equal to 360 so:
[tex]55+8x+69+19x-9+12x+50=360[/tex]and we solve for x so:
[tex]\begin{gathered} 39x=360-165 \\ x=\frac{195}{39} \\ x=5 \end{gathered}[/tex]