Answer:
x = 6
Step-by-step explanation:
All triangles add up to 180 degrees
46 + 12x - 5 + 67 = 180
46 + 12x - 5 + 67 - 67 - 46 + 5 = 180 - 67 - 46 + 5
12x / 12 = 72 / 12
Answer: x = 6