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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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