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8- ( -( -17) +5 - 5
8 - (+ 17 )
8 - 17 =9
b . -8 - ( - ( -4 - 4 - (6 - 7)=
-8 - (- ( -4 -4 -1 )
-8 - ( - ( 9 )
-8 - ( +9 )
-8 -9
-17
c. 21 + (-(13+(-11) + (-5 - (-7)=
... te escribo lo que sigue por mensaje que se me acabo el tiempo para poner las respuestas...