jawab pake cara ya jawab dengan benar

180° = 60° + ABC + ACB
180° = (4x - 10) + ABC → ABC = 190° - 4x
180° = (3x + 5) + ACB → ACB = 175° - 3x

maka
180° = 60° + (190° - 4x) + (175° - 3x)
120° = 190° - 4x + 175° - 3x
120° = 365° - 7x
7x = 365° - 120°
7x = 245°
x = 35°

ABC = 190° - 4x
ABC = 190° - 4(35°)
ABC = 190° - 140°
ABC = 50°