Answer:
| 2 | + | 4 | = 6
| − 3 | + | 5 | = 8
| − 7 | + | − 1 | − | 6 | = 2
Anything that is an absolute value is positive so you just add the numbers normally... even if the numbers are negative..
( if you have any questions please comment on this question so I can help you)