tolong bantuannya,nomor 15 dan10 ya... please

(9x-2)+(3x+2)=180
9x+3x=180+2-2
12x=180
x=180:12
x=15°

abd=(9x-2)°
9.15-2
135-2
133°

semoga membantu

nilai x = 9x - 2 + 3x + 2 = 180
= 9x + 3x -2 + 2 = 180
= 12x = 180
nilai x = 180/12 =15
< abd = 9x - 2
= 9 . 15 -2
< abd = 133 derajat