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13
Negative 20. 13 - -20 = 33
It is: 132 minus 99 = 33
-33 minus -23 is -10.
33 - 17 = 16
33 - 9 = 24
33 - 4 = 29
62 minus 29 is 33.
2,012 minus 1,979 is 33.
137 minus 104 is 33.
minus 20
33 - 18 = 15
-20 negative 20 minus 20