I am using the following environment and want to have alignment for each the first two, the second two and the third two equations at the =-Symbol. In this moment everything aligns at the same point but this way the last equation for instance is too far on the left. What would you suggest? Splitting it up in three align-environments doesn't help as then the seperation between the equations would be too big.
\begin{align}
Cov\left(\tilde{c}_D,\tilde{r}_M\right) &= \sum_{i=1}^4f_i\left(c_{D,i}-E(\tilde{c}_D)\right)\left(r_{M,i}-E(\tilde{r}_M)\right),\\
Cov\left(\tilde{c}_E,\tilde{r}_M\right) &= \sum_{i=1}^4f_i\left(c_{E,i}-E(\tilde{c}_E)\right)\left(r_{M,i}-E(\tilde{r}_M)\right),\\
V_D &= \frac{E(\tilde{c}_D) - \left( E\left(\tilde{r}_M\right) - r_f\right)\frac{Cov\left(\tilde{c}_D,\tilde{r}_M\right)}{\sigma_{\tilde{r}_M}^2}}{1+r_f},\\
V_U &= \frac{E(\tilde{c}_E) - \left( E\left(\tilde{r}_M\right) - r_f\right)\frac{Cov\left(\tilde{c}_E,\tilde{r}_M\right)}{\sigma_{\tilde{r}_M}^2}}{1+r_f},\\
\mu_D &= \frac{E(\tilde{c}_D)}{V_D} - 1 \text{~und~}\\
\mu_E &= \frac{E(\tilde{c}_E)}{V_E} - 1.
\end{align}
\documentclass
and ends at\end{document}
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