I want to write the following equation in such a way that right align is possible. That is all right most elements are in same column. Here left align is done.
\begin{eqnarray*}
y_{0}&= &(r_{73} + 1)r_{9} + ((r_{73} + 1)r_{93} + r_{73} + 1)r_{108} + ((r_{73} + 1)r_{93} + r_{73} + 1)r_{110} + ((r_{73} + 1)r_{93} + \\
& &r_{73} + 1)r_{98} + ((r_{73} + 1)r_{93} + (r_{73} + r_{93})r_{115} + r_{73} +1)r_{123} + ((r_{73} + 1)r_{93} + (r_{73} + r_{93})\\
& &r_{115} + r_{73} + 1)r_{85} + ((r_{73} + 1)r_{93} + (r_{73} + r_{93})r_{115} + ((r_{68} + 1)r_{73} + ((r_{68} + 1)r_{73} + r_{68} \\
& & + 1)r_{93} +((r_{73} + 1)r_{93} + r_{73} + 1)r_{110} + ((r_{68} + 1)r_{73} + (r_{68} + 1)r_{93} + (r_{73} + r_{93})r_{110})r_{115} \\
& &+ r_{68} + 1)r_{131} +r_{73} + 1)r_{88} + ((r_{68} + 1)r_{73} + ((r_{68} + 1)r_{73} + r_{68} + 1)r_{93} + ((r_{68}r_{73} + r_{68})\\
& &r_{93} + r_{68}r_{73} +r_{68})r_{110} + ((r_{68} + 1)r_{73} + (r_{68} + 1)r_{93} + (r_{68}r_{73} + r_{68}r_{93})r_{110})r_{115} + \\
& &r_{68} + 1)r_{131} + (r_{15} + r_{36} +r_{48} + r_{6} + r_{61} + r_{7})r_{73} + ((r_{73} + r_{93})r_{108} + (r_{73} + r_{93})r_{110} \\
& &+ (r_{73} + r_{93})r_{98} + (r_{15} +r_{36} + r_{48} + r_{6} + r_{61} + r_{7})r_{73} + (r_{15} + r_{36} + r_{48} + r_{6} + r_{61} \\
& &+ r_{7} + r_{9})r_{93} + r_{73}r_{9} + 1)r_{115} +((r_{73} + 1)r_{9} + (r_{15} + r_{36} + r_{48} + r_{6} + r_{61} + r_{7})r_{73} \\
& &+ r_{15} + r_{36} + r_{48} + r_{6} + r_{61} + r_{7} + 1)r_{93} +r_{103} + r_{11} + r_{113} + r_{12} + r_{128} + r_{14} + r_{15} \\
& &+ r_{20} + r_{36} + r_{41} + r_{48} + r_{53} + r_{6} + r_{61} + r_{66}+ r_{7} + r_{90}\\
\end{eqnarray*}
eqnarray
!