1/6 - (5/12 - 7/12) = 1/6 - (-2/12) = 1/6 + 2/12 = 1/6 + 1/6 = 2/6 = 1/3
-5/8 - (5/8 - 1) = -5/8 - 5/8 + 1 = -10/8 + 1 = -5/4 + 1 = -5/4 + 4/4 = -1/4
1/6 - (5/12 - 7/12) = 1/6 - (-2/12) = 1/6 + 2/12 = 1/6 + 1/6 = 2/6 = 1/3
-5/8 - (5/8 - 1) = -5/8 - 5/8 + 1 = -10/8 + 1 = -5/4 + 1 = -5/4 + 4/4 = -1/4