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\[\hat{H}\vec{\Psi}=E\vec{\Psi}\]
\[\ce{H2O + HCL <=> H3O+ + Cl-}\]
\[\begin{bmatrix}
1 & 2 & 3\\
a & b & c
\end{bmatrix}\]
\[\begin{equation} E=mc^2 \end{equation} \]
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