Respuesta:
[tex]2θ + 2 \alpha + 2x - 10 + 30 = 180 \\ 2θ + 2 \alpha + 2x + 20 = 180 \\ 2θ + 2 \alpha + 2x = 160 \\ θ + \alpha + x = 80[/tex]
*
[tex]2x - 10 = 30 \\ 2x = 30 + 10 \\ 2x = 40 \\ x = 20[/tex]
Espero te ayude.
