Respuesta :

(5x + 10) = (4x - 10)

9x = 0

x = 0
5x+10 and 4x-10 are consecutive angles, therefore:

(5x+10)+(4x-10)=180

Combine like terms:

9x=180
9x/x=180/9
X=20
RELAXING NOICE
Relax