(1)
\begin{eqnarray}
ab &=& x^2 \nonumber \\
&=& y^2 \nonumber \\
&=& 3
\end{eqnarray}
(2)
\usepackage{amsmath}
\begin{align}
ab &=x^2 \nonumber\\
&=y^2 \nonumber\\
&=3
\end{align}
The second looks better even the fist one is recommended by the text book.
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