Here is my split equation:

```
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
\begin{split}
a_{ijk} =& \frac {Pr(M_{I} =2 \& M_J=1 \& M_K =1 | I=i , J=j , K=k)}{Pr (M_I =1 \& M_J =1 \& M_K=1 | I=i , J=j)} \\
=& \frac {\mu_{ijk211}}{\mu_{ijk111}}\\
\end{split}
\end{equation}
\end{document}
```

I want to align this equation to the left. Is this possible in an `equation`

environment?

## Best Answer

I would not use the equation environment; rather, I would use flalign as such:

(notice the && at the end of each line)Another way to go is to set the

`fleqn`

option for the document class. However, this left-alignsallof your equations and hence should not be used when you want at least some equations to remain centered.For this output:

As suggested by karlkoeller, if you want to get rid of the space between the left margin and the equation (to get a result similar to the first case), you should add

`\setlength{\mathindent}{0pt}`

. If you later want to indent it back to its default value, you can use the same command with a value of`15pt`

, which is the amount of`pt`

a paragraph indent shifts its text to the right.