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(+42)10 + (-13)10 = (101010)2 + (-1101)2 = (101010)2 + (110011)2 = (1011101)2 = (11101)2 = (29)10

(-42)10 - (-13)10 = -42 + (-(-13)) = -42 + 13 = (-101010)2 + (1101)= (-101010)2 + (1101)2= (010110)2 + (001101)= (100011)There is no carry. Thus the answer is (-11101)2 = (-29)10

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