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]

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