Label $\rightleftharpoons$ with x and y: Tutorial

[Dustinsfl]

So I am trying to use $ \rightleftharpoons $ but I want to label both pieces like $\xleftarrow[y]{x}$.

How can I do this?

 

[Ackbach]

So I am trying to use $ \rightleftharpoons $ but I want to label both pieces like $\xleftarrow[y]{x}$.

How can I do this?

Maybe $\underset{y}{\overset{x}{\rightleftharpoons}}$ ?

 

[Plato2]

So I am trying to use $ \rightleftharpoons $ but I want to label both pieces like $\xleftarrow[y]{x}$.
How can I do this?

\underset{y}{\overset{x}{\longleftrightarrow}} gives $\underset{y}{\overset{x}{\longleftrightarrow}}$

 

[Evgeny.Makarov]

Also $\mathop{\rightleftharpoons}\limits^x_y$.