Answer:
x=16
Explanation:
The angles indicated are alternate exterior angles and alternate exterior angles are equal when the lines are parallel
5x+28 = 7x-4
Subtract 5x from each side
5x+28 -5x = 7x-4-5x
28 = 2x-4
Add 4 to each side
28+4 = 2x-4+4
32 = 2x
Divide by 2
32/2 = 2x/2
16 =x