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Resolvemos,
[-(6+7)-[-(5-9)+8]-(6-10)]=
[-(13)-[-(-4)+8]-(-4)]=
Aplicamos ley de signos para eliminar los paréntesis,
[-(13)-[-(-4)+8]-(-4)]=
[-13-[4+8]+4]=
[-13-[12]+4]=
[-13-12+4]=
-21
La Respuesta es -21
Espero que te sirva, Saludos!!