Answer:
x = 4 and x = 7
Explanation:
→ Find the sum of both the angles
3x + x + 74 = 4x + 74
6x + x + 13 = 7x + 13
→ Equate both equations to 90
4x + 74 = 90
7x + 13 = 90
→ Minus 74 and 13
4x = 16
7x = 77
→ Divide by 4 and 7 respectively
x = 4 and x = 7