[Tex/LaTex] Show equation number only once in align environment


I want the equation number to be shown only at the last line, or better, somewhere in the middle of all. So instead of (1), (2), ... only (1).
I use \begin{align} ... \end{align}

Best Answer

You can use the split environment from the amsmath package:



  a &= b \\
  &=c \\
  &=d \\

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