3/6 + (12/15 + 1/3) :2/3

3/6 + (12/15 + 1/3) : 2/3
= 3/6 + 17/15 : 2/3
= 3/6 + 17/10
= 11/5 atau 2 1/5
Maaf kalo salah, dan semoga membantu.