Answers

2014-01-15T18:57:51+08:00
2014-01-15T19:43:18+08:00
I think this is a Algebraic Expression :)
n = -6

(-6) - 13
Since it has something to do with integer, there will be some changes
(-6) - 13
  |   |  |
-6  + -13
= -19

PS. Note that the sign " | "  means arrow XD
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