Elementary Brain Teaser - September 25, 2023

A unit fraction is a fraction in the form of 1/n where n is a positive integer and the numerator is one.  The difference between two unit fractions is 1/72.  In other words, 1/a - 1/b = 1/72 where a and b are different numbers.  If 1/b is less than 1/a, find the value of a.

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