12 7/23 - (6 18/23 - t) = 3 21/23 + 5 19/23
12 7/23 - 6 18/23 + t = 8 40/23
t = 8 40/23 - 12 7/23 + 6 18/23
t= 2 51/23 = 4 5/23
12 7/23 - (6 18/23 - t) = 3 21/23 + 5 19/23
12 7/23 - 6 18/23 + t = 8 40/23
t = 8 40/23 - 12 7/23 + 6 18/23
t= 2 51/23 = 4 5/23