1/4 + (7/18) 1 1/23 - 1 = 1/4 + 7/18 (23/23) - 1 = 1/4 + 7/18 - 1 = 9/36 + 14/36 - 36/36 = 23/36 - 36/36 = -13/36
1/4 + (7/18) 1 1/23 - 1 = 1/4 + 7/18 (23/23) - 1 = 1/4 + 7/18 - 1 = 9/36 + 14/36 - 36/36 = 23/36 - 36/36 = -13/36