Question

2x + 40 = x+50° = 5x-10°

Answer 1

2x+40°+x+50°+5x-10°=180°

agrupe os termos com x e os graus
2x+5x+x+40°+50°-10°=180°
8x+80°=180°
8x=180-80
8x=100
x=100/8
x= 12,5° ou 12°30'