12 2/3 - 7 4/8 + 2 2/5 = n

12 - 7=5
2/3 - 4/8= 16/24 - 12/24= 4/24 =1/6 = 5 1/6

5+2=7
1/6 + 2/5 = 5/30 + 12/30 = 17/30 = 7 17/30

jadi 7 17/30

mohon maaf jika salah