tolong bantu jawab sekalian cara nya

6. 2B/3 + 10B/3 + B = 180
2B/3 + 10B/3 + 3B/3 = 180
15B/3 = 180
5B = 180
B = 180 : 5 = 36derajat

7. 90 + y+6 + 2y = 180
96 + 3y = 180
3y = 180 - 96
3y = 84
y = 84 : 3 = 28
M = y + 6
M = 28 + 6
M = 34