-17/15.
1/5 1/6 + 7/20 1/6 - 1/4 * 1/6 = 1/30 + 7/120 - 1/24 = 1/30 + 7/120 - 5/120 = 4/120 = -1/30 = -17/15.
-17/15.
1/5 1/6 + 7/20 1/6 - 1/4 * 1/6 = 1/30 + 7/120 - 1/24 = 1/30 + 7/120 - 5/120 = 4/120 = -1/30 = -17/15.