=2+{207-[23+(495+1213):4]:10-144}-9
=2+[207-(23+1708:4):10-144]-9
=2+[207-(23+427):10-144]-9
=2+(207-450:10-144)-9
=2+(207-45-144)-9
=2+(162-144)-9
=2+18-9
=20-9
=11