Question

ayudaaaaaaa.........plisss..

Answer 1

$2 \alpha +6 \alpha -70 +90 = 180$

$8 \alpha +20 = 180$

$8\alpha = 180 - 20$

$8 \alpha = 160$

$\alpha = \frac{160}{8}$

$\alpha = 20$

El angulo buscado es 20°