Puzzle of the Week #18 - Egyptian Fractions

In ancient Egypt, they only liked to use so-called unit fractions, which are fractions that have 1 as the numerator. If they wanted to represent a fraction that wasn't already a unit fraction, they would express as the sum of different unit fractions.

So, for instance 3/4 = 1/2 + 1/4. and 2/7 = 1/4 + 1/28.

How can you express 39/50 as a sum of different unit fractions?