Bonsoir,
B=-3/8 - 5/12
= 9/24 -10/24 = -1/24
C=-5/12 + 7/18
-15/36 + 14/36 = -1/36
D=-7/6 - 11/12 + 5/9.
-42/36 - 33/36 + 20/36 = -25/36
E=(5/32 + 3/16) - (7/8 - 1/12)
(5/32 + 6/32) - ( 21/24 - 2/24)
=11/32 - 23/24
= 11/32 * 24/24 - 23/24 * 32/32
= 264/768 - 736/768
= - 472/768 = -236/384 = - 118/192 = - 59/96