(1-3/7) + 1 3/7 = 4/7 + 1 3/7 = 1 7/7 = 2
(5-3/4) - (2 1/4+1 3/4) = 4 1/4 - 4 = 1/4
(5/11+6/11) - (1-6/11) = 1 - 5/11 = 6/11
(1-3/7) + 1 3/7 = 4/7 + 1 3/7 = 1 7/7 = 2
(5-3/4) - (2 1/4+1 3/4) = 4 1/4 - 4 = 1/4
(5/11+6/11) - (1-6/11) = 1 - 5/11 = 6/11