LaTeX.org

Hi,

I'm trying make a system of equations look like this:

a = b
1 + 2 = 3 where a and 1 are in one column, b and 3 in one, as well as the equal signs.

I tried the built-in commands as well as amsmath and I'm open to any solution.

(1)
\begin{align*}
a=b \tag{1} \\
1+2=3
\end{align*}
(2 ...