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- (7 - 3) - (5 - 2) - [(12 - 6) - (9 - 5)] =
- ( 4) - (3) - [6 - (4)] = Para quitar parentsis aplicas ley de signos
- por + = -
- 4 - 3 - [6 - 4] =
- 7 - [2] =
-7 - 2 =
-9
Respuesta.
- 9