Respostas

2014-02-20T15:01:05-03:00
|-16| + |+13| - |-20|
16 + 13 - 20
29 - 20 = 9
1 5 1
2014-02-20T15:04:26-03:00
 |-16| + |+13| - |-20|
 16 + 13 - 20
 29 - 20 = 9  

:)