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A = - ( - 19 + 3 - 7) - ( + 5 - (- 7 - 11)) =
A = - (- 26 + 3) - ( + 5 - (- 11)) = Utilizas ley de signos - por - = +
A = - ( - 23) - (+ 5 + 11))
A = + 23 - ( +16)) = Utilizas ley de signos para quitar el parentesis
- por + = -
A = 23 - 16
A = 7
Respuesta.
A = 7