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<center> <h1>A test of Equation Numbering</h1> </center>

<div style=“padding:0 2em”> <hr> Equation:

begin{equation} E = mc^2 end{equation}

Equation*:

begin{equation*} E = mc^2 end{equation*}

<hr> Brackets:

[E = mc^2]

Brackets tagged:

[E = mc^2tag{x}]

<hr> Split:

begin{equation} begin{split} a& =b+c-d\ & quad +e-f\ & =g+h\ & =i end{split} end{equation}

<hr> Multline:

begin{multline}

a+b+c+d+e+f+g\\
M+N+O+P+Q\\
R+S+T\\
u+v+w+x+y+z

end{multline}

Multline*:

begin{multline*}

a+b+c+d+e+f+g\\
M+N+O+P+Q\\
R+S+T\\
u+v+w+x+y+z

end{multline*}

<hr> Gather:

begin{gather} a_1=b_1+c_1\ a_2=b_2+c_2-d_2+e_2 end{gather}

Gather*:

begin{gather*} a_1=b_1+c_1\ a_2=b_2+c_2-d_2+e_2 end{gather*}

<hr> Align:

begin{align} a_1& =b_1+c_1\ a_2& =b_2+c_2-d_2+e_2 end{align}

Align*:

begin{align*} a_1& =b_1+c_1\ a_2& =b_2+c_2-d_2+e_2 end{align*}

Align:

begin{align} a_{11}& =b_{11}& a_{12}& =b_{12}\ a_{21}& =b_{21}& a_{22}& =b_{22}+c_{22} end{align}

Align with notag and tag:

begin{align} a_{11}& =b_{11}& a_{12}& =b_{12}notag\ a_{21}& =b_{21}& a_{22}& =b_{22}+c_{22} tag{y} end{align}

Align* with tag:

begin{align*} a_1& =b_1+c_1tag{z}\ a_2& =b_2+c_2-d_2+e_2 end{align*}

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