tolong yadi jawab masih pemula tolong pake cara y

a. 105 + 3a = 180
3a = 180 - 105
3a = 75
a = 25°

b 105 + 3b = 180
3b = 180 - 105
3b = 75
b = 25°

c. a + b = 25 + 25
= 50°