Last one I need help with

Answer:
x=12
Step-by-step explanation:
The angles are alternate exterior angles, and if the alternate exterior angles are equal, the lines are parallel
5x= 4x+12
Subtract 4x from each side
5x-4x =4x-4x+12
x = 12
Answer:
The value of X that will make AIIB is 12.
Step-by-step explanation:
1. 5x= 4x+12.
2. Subtract 4x from each side.
3. 5x-4x =4x-4x+12.
4. x = 12.