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+10 -12 -9 -10 +13
10+13 -12-9-10
23 - 31
-8
+ por + = +
- por - = +
+ por - = -
- por + = -
(+ 10) + ( - 12) - ( + 9) - ( + 10)) - ( - 13) =
+ 10 - 12 - 9 - 10 + 13 = simplificas el 10
- 12 - 9 + 13
- 21 + 13 =
- 8
Respuesta.
- 8