How to align separate equations to one side

Question

I'm writing several separate equations using

\begin{equation*}
equations in here
\end{equation*}

\begin{equation*}
equations in here
\end{equation*}

\begin{equation*}
equations in here
\end{equation*}

Each equation is long and has a series of steps involved. I have aligned each step within each equation so that each equation looks "professional". The problem when doing this is that some of the equations, themselves, start in different places depending on their length in the document. Some start a little to the left, some a little more to the right. Is there a way to align separate equations? I tried surrounding the equations with align*but each equation stays the same. I just want each separate equation lined up say to the left for example. Is this possible?

Answer 1

It is possible, for example, with the flalign* environment. Just surround each equation with &...&.

MWE

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\noindent These are my equations

\begin{flalign*}
  &x=y&\\
  &a+b+c+d+e=f&\\
  &jk=xyz&
\end{flalign*}


\end{document} 

Output

Each equations can be inserted in a separated flalign*, if you want

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\noindent These are my equations

\begin{flalign*}
  &x=y&
\end{flalign*}

\begin{flalign*}
  &a+b+c+d+e=f&
\end{flalign*}

\begin{flalign*}
  &jk=xyz&
\end{flalign*}

\end{document} 

Output

---

As barbara beeton notices in the below comment, the spacing between consecutive flaligns is too large. To avoid that, you can redefine locally the lengths \abovedisplayskip and \belowdisplayskip, as in the following example:

\documentclass{article}
\usepackage{amsmath}

\begin{document}
\noindent These are my equations

{\setlength{\abovedisplayskip}{0ex}\setlength{\belowdisplayskip}{1ex}
\begin{flalign*}
  &x=y&
\end{flalign*}

\begin{flalign*}
  &a+b+c+d+e=f&
\end{flalign*}

\begin{flalign*}
  &jk=xyz&
\end{flalign*}
}

\end{document} 

Output