Answer:
3
Step-by-step explanation:
8x and 7x + 3 are vertically opposite angles.
Vertically opposite angles are equal,
8x = 7x + 3
8x - 7x = 3
x = 3
DCE=156°
8x=7x+3
8x-7x=3
x=3
BCD+DCE=180
8x+DCE=180
24+DCE=180
DCE=180-24
