If you cannot do this sum in your head, you should try using a calculator. The answer is 12.
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Negative twenty nine minus negative twenty one is negative eight.
Minus 30
Twenty five minus one third is 24 and 2/3. You may have also meant twenty five minus one third of twenty five. That would be 16 and 2/3.
1 minus 25/28 is 3/28
16 minus 21 is -5