Here's a solution that uses two array
environments. Observe that I've set the numbers to the right of each =
symbol to be right-aligned; if you prefer left-alignment, just change
\begin{array}[t]{*{2}{r@{{}={}}r @{\quad}} r@{{}={}}r}
to
\begin{array}[t]{*{2}{r@{{}={}}l @{\quad}} r@{{}={}}l}
Or, if you prefer, use two aligned
environments side-by-side, using [t]
positioning specifiers. This approach entails making fewer modifications to the code you've posted in your query. However, it doesn't afford the option to right-align the numbers to the right of the =
symbols.
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[ % Solution 1: Use two side-by-side 'array' environments
\renewcommand\arraystretch{1.25}
\begin{array}[t]{*{2}{r@{{}={}}r @{\quad}} r@{{}={}}r}
x_8 & 93 & y_8 & 64 & z_8 & 61\\
x_7 & 186 & y_7 & 32 & z_7 & 61\\
x_6 & 231 & y_6 & 32 & z_6 & 29\\
x_5 & 462 & y_5 & 16 & z_5 & 29\\
x_4 & 483 & y_4 & 16 & z_4 & 13\\
x_3 & 966 & y_3 & 8 & z_3 & 13\\
x_2 & 975 & y_2 & 8 & z_2 & 5\\
x_1 & 1950 & y_1 & 4 & z_1 & 5\\
x_0 & 1953 & y_0 & 4 & z_1 & 1
\end{array}
\quad
\begin{array}[t]{*{2}{r@{{}={}}r @{\quad}} r@{{}={}}r}
x_5 & 65 & y_5 & 128 & z_5 & 1\\
x_4 & 130 & y_4 & 64 & z_4 & 1\\
x_3 & 260 & y_3 & 32 & z_3 & 1\\
x_2 & 520 & y_2 & 16 & z_2 & 1\\
x_1 & 1040 & y_1 & 8 & z_1 & 1\\
x_0 & 2080 & y_0 & 4 & z_0 & 1
\end{array}
\]
\[ % Solution 2: Use two side-by-side 'aligned' environments
\begin{aligned}[t]
x_8 &= 93 & y_8 &= 64 & z_8 &= 61\\
x_7 &= 186 & y_7 &= 32 & z_7 &= 61\\
x_6 &= 231 & y_6 &= 32 & z_6 &= 29\\
x_5 &= 462 & y_5 &= 16 & z_5 &= 29\\
x_4 &= 483 & y_4 &= 16 & z_4 &= 13\\
x_3 &= 966 & y_3 &= 8 & z_3 &= 13\\
x_2 &= 975 & y_2 &= 8 & z_2 &= 5\\
x_1 &= 1950 & y_1 &= 4 & z_1 &= 5\\
x_0 &= 1953 & y_0 &= 4 & z_1 &= 1
\end{aligned}
\qquad
\begin{aligned}[t]
x_5 &= 65 & y_5 &= 128 & z_5 &= 1\\
x_4 &= 130 & y_4 &= 64 & z_4 &= 1\\
x_3 &= 260 & y_3 &= 32 & z_3 &= 1\\
x_2 &= 520 & y_2 &= 16 & z_2 &= 1\\
x_1 &= 1040 & y_1 &= 8 & z_1 &= 1\\
x_0 &= 2080 & y_0 &= 4 & z_0 &= 1
\end{aligned}
\]
\end{document}
align*
environment to generate (de facto) a single unnumbered display-math structure. Use\[ ... \]
instead.