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- . + = -
-(+(-3))
- . + = -
-(-3)
- . - = +
+3 .......respuesta.
Un abrazo.
+ + =+
+ - = -
- + = -
- - = +
Aplicas :
-(+(+(-3)))
-(+(-3))
-(-3)
+3
Rpta: 3
Suerte y saludos !!