When using align, the = sign and the -sign don't get properly aligned. How can I get these two to be properly aligned?
MWE:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
&-& &\sum_{n=0}& &\frac{a}{b}& \\
&=& &\sum_{n=0}& &\frac{a}{b}&
\end{align}
\end{document}
&{}-{}& &\sum_{n=0}& &\frac{a}{b}&(the addition of empty groups{}before/after the-) will adjust the first line properly – Steven B. Segletes Feb 02 '17 at 12:55=in a group, as in&{=}& &\sum_{n=0}& &\frac{a}{b}&– Steven B. Segletes Feb 02 '17 at 13:08\mathrel{-}, which changes the spacing around-to match that of=. – Werner Feb 02 '17 at 18:00