documentclass{article}

usepackage{amsfonts, amsthm, amsmath, amssymb}

begin{document}



noindent Text text text text text text text:
%
begin{align}
123456789012345678901234567890123456789012345678901234567890=\
123456789012345678901234567890123456789012345678901234567890text{.}
end{align}
%
text text text text text text text.



end{document}