# How do I get the alignment right for this equation?

Column pairs in `align`

are separated by a wide blank space. You need `alignat`

, but it's not really easy to take care of the necessary tricks.

I find it more convenient to use `array`

for this application.

Note that your redefinition of `\Re`

is not the best.

```
\documentclass{article}
\usepackage{amsmath,array}
\renewcommand{\Re}{\operatorname{Re}}
\begin{document}
\begin{alignat*}{3}
-1 &\leq{} & \Re z &\leq 1 \\
-2 &\leq{} & 2\Re z &\leq 2
\end{alignat*}
\begin{equation*}
\setlength{\arraycolsep}{0pt}
\renewcommand{\arraystretch}{1.2}
\begin{array}{r >{{}}c<{{}} r >{{}}c<{{}} r}
-1 &\leq& \Re z &\leq& 1 \\
-2 &\leq& 2\Re z &\leq& 2
\end{array}
\end{equation*}
\end{document}
```

With `>{{}}c<{{}}`

we reserve a column for the relation symbols, suitably spaced because of the empty items around them.

With multiple alignment points within the same construction, it's best to use `alignat`

(and friends):

```
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{alignat*}{2}
-1 \leq {}&& \Re{z} & \leq 1 \\
-2 \leq {}&& 2\Re{z} & \leq 2
\end{alignat*}
\end{document}
```