LaTeX Forum

\begin{document}
\usepackage{tabularx}
\newcolumntype{L}[1]{>{\raggedright\arraybackslash}m{#1}} 

\begin{tabular}{L{.6\textwidth}r}
\label{equa:proc.rawmaterial}
  $\sum_{s \in S_p^{in}} \sum_{l \in L_r} a_{psl}^{in} \cdot x_{slt} \leq q_{prt}^{in}$ & $\forall r \in R, \forall p \in PR , \forall t \in T$
\end{tabular}
\end{document}

\documentclass[11pt]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage{mathtools}   % lädt »amsmath«

\begin{document}
  \begin{flalign}\label{eqn:proc.rawmaterial}
    \sum_{s \in S_p^{in}} \sum_{l \in L_r} a_{psl}^{in} \cdot x_{slt} \leq q_{prt}^{in} && \forall r \in R, \forall p \in PR , \forall t \in T
  \end{flalign}
\end{document}