### A good answer might be: 0011 1000 (incorrect) The integer to be subtracted is complemented:
    0111 1000 ===> 1000 0111 + 1 ==> 1000 1000
...then added to the other:
    10000 000
     1011 0000    == - 80d
     1000 1000    == -120d
     ---------      -----
     0011 1000        +56d !??!!
Since the carry into the most significant column is NOT the same as the carry out, the result is not correct.
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