Respuesta :

★ According to the question,

Sum of all angles = 540°

So,

67 + 7x + 7x + 4x - 4 + 6x - 3 = 540

→ 60 + 24x = 540

→ 24x = 540 - 60

→ 24x = 480

→ x = 20

Therefore the value of x is 20°