documentclass{article}
usepackage{mathtools}
usepackage{amsmath}

begin{document}
begin{flalign}
A = & B & C = & D \
E = & F & G = & H
end{flalign}
end{document}

documentclass{article}
usepackage{mathtools}
usepackage{amsmath}
usepackage{multicol}

begin{document}
begin{multicols}{2}
begin{align}
A = & B \
E = & F
end{align}
columnbreak
begin{align}
C = & D \
G = & H
end{align}
end{multicols}

end{document}