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\begin{equation}

\begin{pmatrix}

M&m_1&m_2&0 \\

0&m_{1}&-m_2&0 \\

2&-1&-1&0

\end{pmatrix}

\begin{pmatrix}

A \\ a\\ b\\ T

\end{pmatrix}

=

\begin{pmatrix}

F-Mg-(m_1+m_2)g \\ (m_2-m_{1})g \\ 0

\end{pmatrix}

\end{equation}

\begin{equation}

H_c=\frac{1}{2n} \sum^n_{l=0}(-1)^{l}(n-l)^{p-2}

\end{equation}

\begin{equation}

\left.\begin{aligned}

B’&=-\partial\times E, \\

E’&=\partial \times B – 4\pi j,

\end{aligned}

\right\}

\qquad \text{Maxwell’s equations}

\end{equation}