tolong bantuuu(!)besar sudut BAC?

CBA = 180 - 166.
CBA = 14.

14 + 2x + 10 + x - 15 = 180.
3x = 180 - 14 - 10 + 15.
3x = 171.
x = 171/3.
x = 57.

BAC = x - 15.
BAC = 57 - 15.
BAC = 42.

misal sudut bac adalah x,maka
(2x+10)+(x-15)+(x)=180. Jadi,besar bac adl 46,25
4x-5 =180. *MAAF JIKA SALAH*
4x =180+5
4x. =185
x. =185/4
x. =46,25
2x+10=2×46,25+10
=92,5+10
=102,5
x-15=46,25-15
=31,25