Solve for x.
15x+5+60+22x+4=180
37x+69 = 180
37x = 111
x=3
Angle ∠CDB is just 180 - 120 = 60 degrees. Since the total degree of the angles in a triangle are 180o, we can write an equation: 60 + (22x + 4) + (15x + 5) = 180 60 + 4 + 5 + 22x + 15x = 180 69 + 37x = 180
x = 3
15x + 5 + 22x + 4 = 120
+592 
