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10 - (9 +[8 - (13)]) =
10 - (9 + [8 - 13]) =
10 - (9 + [-5]) =
10 - (9 - 5) =
10 - ( 4 ) =
10 - 4 = 6
b) [ (3 - 8) - 5] + { - 11 + [ 7 - ( 3 - 4)]} =
[ (-5) - 5] + { - 11 + [ 7 - (- 1)]} =
[ - 5 - 5 ] + { - 11 + [ 7 + 1)]} =
[ - 10 ] + { - 11 + [ 8 ]} =
[ - 10 ] + { - 11 + 8 } =
[ - 10 ] + { - 3 } =
[ - 10 - 3 ] =
- 10 - 3 = - 13