I have seen some posts close to what I need, but not quite what I need.
I would like to produce two equations on the same line with one equation number adjusted to left and one to the right. Both equations should be multiline.
And I want to generate a \tag for both equation labels.
So the output should look like what is produced by the code below.
\begin{array}{llrr}
& a=b & x=y & \\
(eq1) & c=d & y=z & (eq2) \\
& e=f & u=v
\end{array}
District 9
(assuming you are referring to it with your name) :).