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31 - 19 = 12
31-(-6) We know minus and minus becomes plus 31+6 37
-31
-3
31
31 - 13 = 18
38 - 19 + 12 = 31
31 minus 9 is 22 31 - 9 = 22
-19
minus 20
31 - 17 = 14
2012 - 31 = 1981
74 minus 43 is 31.