★ 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°
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