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( - 3) + ( - 9) + ( - 6) = Aplicas ley de signos - por + = -
- 3 - 9 - 6 =
- 18
( - 13) + (+ 5) + ( + 8) = aplicas ley de signos + por + = +
+ por - = -
-13 + 5 + 8 =
-13 + 13 =
0