-5/6+3/8=-7,5+2,8=4,5-8,3=-2 5/7-1 3/14=
1. -5/6+3/8=-20/24+9/24=-11/24
2. -7,5+2,8=-4,7
3.4,5-8,3=-3,8
4.-2 5/7 -1 3/14=-19/7-17/14=-38/14-17/14=-55/17