Answer:
Since the ray bd is bisecting the angle abc, equate 3x + 4 to 7x - 20.
Step-by-step explanation:
3x + 4 = 7x - 20
x = 6
.. Therefore, angle abc = 3x + 4 + 7x - 20
= 18 + 4 + 42 - 20
= 44
