81 - 72 = 9
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if u minus 59 from 81 you get 22
There are several combinations that could equal 81 when subtracted. For example, 100 - 19 = 81, or 90 - 9 = 81.
81 minus 86 = -5
x4 - 81 = 0x4 = 81x = 3
18/27 minus 44/81 is 10/81