# Aligning Multi-line Equations

Published on 30 Nov 2007Tags #LaTeX

It often makes reading equations a lot easier when breaking them up across lines:

## Aligning with line numbering

Aligned equation with a number on each line: The equation is aligned at the & character. This feels quite like a tabular environment.

```
\begin{align}
(a + b)^2 &= a^2 + 2ab + b^2 \\\
&= b^2 + 2ba + a^2 \\\
&= (b + a)^2 \\\
\end{align}
```

## Aligning with single line number

Aligned equation with a single number:

```
\begin{equation}
\begin{split}
(a + b)^2 &= a^2 + 2ab + b^2 \\\
&= b^2 + 2ba + a^2 \\\
&= (b + a)^2 \\\
\end{split}
\end{equation}
```

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