4 - (-39) = 4 + 39 = 43
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-35 - 4 = -39
-4+0-(-4)+(-4)-1= -4+0+4-4-1= -5
993
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 four.....