# Put numbers to equations

I want that latex always puts a number behind an equation that I created with , but not when I did it with . Is this possible?

You should not use  with LaTeX: it's a plainTeX command, and you have incorrect vertical spacings; it's replaced with . If you want numbers with displayed equations, use  for just one equation, and, from the amsmath package, \begin{gather} \end{gather} for a group of centred displayed equations.