20-7 = 13
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7/20
negative 7 -7 - 13 = -20 Example: if someone owed $7 and then also owed $13 the total owed would be $20
-20 negative 20 minus 20
3/4 - 2/5 = 15/20 - 8/20 = 7/20
-3/20 - 5/4 = -3/20 - 25/20 = -28/20 = -7/5