-1 + (7/12 + 10/12) : 5/6 - 2/3
-1 + (17/12) : 5/6 - 2/3
-1 + (17/12) * (6/5) - 2/3
-1 + 17/10 - 2/3
-30/30 + 51/30 - 20/30 = 1/30