It is: 8 - -21 = 29
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21 minus -5 is 26.
the answer of negative 4 minus positive 21 is positive 25 because you leave the negative 4 as is, change the minus to a plus, and change positive 21 to negative 21. (Leave Change Change)
negative 23
Eighteen minus a negative 3 is twenty-one (21).
Negative twenty nine minus negative twenty one is negative eight.