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)
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Negative 4 minus positive 2 is equal to negative 6.
zero.:)
-6
-14 - +7 - -25 = 4
-4 minus 9 is -13