Answer:
The measurement of ABD is 126°.
The measurement of DBC is 54°
Explanation:
A straight line has a measurement of 180.
7x + 14 + 3x + 6 = 180 combine like terms
10x + 20 = 180 Subtract 20 from both sides
10x + 20 - 20 = 180 - 20
10x = 160 Divide both sides by 10
=

x = 16
ABD
7x + 14 Substitute in 16 for x
7(16) + 14
112 + 14
126
DBC
3x + 6 Substitute in 16 for x
3(16) + 6
48 + 6
54