Hello!
Since AOC is a straight line it has an angle of 180
We put the two equations and have them equal 180
6x + 29 + 3x + 124 = 180
Combine like terms
9x + 153 = 180
Subtract 153 from both sides
9x = 27
Divide both sides by 9
x = 3
Now we x into the equation of angle BOC
6(3) + 29 =
Multiply
18 + 29 = 47
The answer is 47°
Hope this helps!