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(- 2) + 5 + 5 + 1 + (- 3) + (- 4) + 7 =
- 2 + 11 + (- 3) + (- 4) + 7 = Para quitar parentesis utilizas ley de signos
+ por - = -
- 2 + 11 - 3 - 4 + 7 =
18 - 9 =
9
Respuesta.
9