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\left\{ \begin{array}{rcrcr}
2x & + & 5y & = & -3 \\
3x & + & y & = & 2
\end{array} \right.
\mbox{\LaTeX}
Q = \sum_i (e_{ii} - a_i^2)
L(\vec{x},\vec{\omega}) = L_e + \int_\Omega f_r(\vec{\omega}, \vec{\omega}&
fx=\int_0^x \oint\,dt