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Thank you very much, that should do the work!

Yes of course! Here is a compilable code of what I would like to obtain..
Thanks! :D


\documentclass[a4paper1]{article}
\usepackage[fleqn]{amsmath}
\usepackage[english]{babel}
\usepackage{environ}

%pour les equations de linearisation
\newcounter{newcounter}
\setcounter{newcounter}{0 ...

Hi everyone!

I have been trying to create a new counter to clearly identify a specific subset of equations. I use the following code to overwrite the equation environment:

\newcounter{newcounter}
\setcounter{newcounter}{0}
\newenvironment{NEWequation}{
\addtocounter{equation}{-1}
\refstepcounter ...