I need help with a riddle

I cannot seem to get this riddle, after giving up I finally googled it, and the answer I found there does not seem to make sense to me.

Thank you.

You have 50 quarters on the table in front of you. You are blindfolded and cannot discern whether a coin is heads up or tails up by feeling it. You are told that x coins are heads up, where 0 < x < 50. You are asked to separate the coins into two piles in such a way that the number of heads up coins in both piles is the same at the end. You may flip any coin over as many times as you want. How will you do it?