Bonjour
A = 7/8 - 3/20
A = (7 x 5) / (8 x 5) - (3 x 2) / (20 x 2)
A = 35/40 - 6/40
A = 29/40
B = 7/24 + 5/32
B = (7 x 4) / (24 x 4) + (5 x 3) / (32 x 3)
B = 28/96 + 15/96
B = 43/96
C = - 13/22 - 10/33
C = (- 13 x 3) / (22 x 3) - (10 x 2) / (33 x 2)
C = - 39/66 - 20/66
C = - 59/66
