There are an infinite amount of answers to that question, like:
73 - 1 = 72
87.196 - 15.196 = 72
72 - 0 = 72
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This year, 2009, minus birth year, 1947, equals 62.
xsquared minus x minus 72
If a equals 3 and b equals minus 5 then a minus b equals what
72 - 19 = 53
72 - 39 = 33