Answer:
19.3
Explanation:
we know that CBE and FBE combined is a supplementary angle which is 180 degrees. first you add them both up
4x-9+5x+15=9x+6
then you know it is equal to 180 degrees
9x+6=180
then you-6 on both sides to get X by itself
9x=174
÷9. ÷9
x=19.33333333
which is 19.3 degrees