tolong bantuin ya qq:)

5. 180 = 3x + 2x + x + 15
180 - 15 = 6x
165 = 6x 
27.5 = x

Sudut A = 2x
Sudut A = 2 x 27.5
Sudut A = 55 (A)

6. 180 = 180 -140 + y +10 +2y + 10
180 - 180 + 140 - 10 - 10 = y + 2y
120 = 3y
40 = y

Sudut CAB = y + 10
Sudut CAB = 40 + 10
Sudut CAB = 50 (C)

semoga bermanfaat !!!!
#wibu