3/8-2/5+1/10-3/14-5/6+1/6+11/14=3/8-(4/10-1/10)+(11/14-3/14)-(5/6-1/6)=3/8-3/10+8/14-4/6=3/8-3/10+4/7-2/3=15/40-12/40+12/21-14/21=3/40-2/21=63/840-80/840=-17/840
3/8-2/5+1/10-3/14-5/6+1/6+11/14
=3/8-(2/5-1/10)+(11/14 -3/14)-(5/6-1/6)
=3/8-(4/10-1/10)+8/14-4/6
=3/8-3/10+8/14-2/3
=21/56+32/56-(9/30+20/30)
=53/56-29/30
=795/840-811/840
=-16/840