Answer:
x = 20
Step-by-step explanation:
the measure of DBA and DBC are on the straight line and they are both equal 180°
so 2x + 6x + 20 = 180
to find x:
2x + 6x + 20 = 180
2x + 6x = 180 - 20
8x = 160
x = 160/8
