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Bartman, I am amazed !!!

Will use the second solution

Many thanks !!!

current.png

centered.png

Here is the code, with remarked \begin{alignat} and \end{alignat}

\documentclass{article}

\usepackage[most]{tcolorbox}

\pagenumbering{gobble}

\begin{document}

% \begin{alignat}

\begin{equation*}
\bar {v} = \frac{s_{uk}}{t_{uk}}
\end{equation*}

\begin{equation ...

Hi Bartman

Thanks for answer.

And the equation is in did different, as i wish to show that before equal sign ( = ) could be more variables...

I did not take another screenshot. Sorry for that.

And, i really do not know how to implement alignat as after i add \begin{alignat}{2} and \end{alignat ...

HI!

Please, help me with finishing document with some physics formulas.

All what has to be done is to align by equal sign.

Please, see the pictures.

current.png

desired.png

\documentclass{article}

\usepackage[most]{tcolorbox}

\pagenumbering{gobble}

\begin{document}

\begin{equation ...