\begin{eqnarray} x & = & 4y + 3z \\ z & > & a + b + ... + j + \\ & & k + l + m \end{eqnarray}
\begin{eqnarray} x & = & 4y + 3z \\ z & > & a + b + ... + j + \\ & & k + l + m \end{eqnarray}