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\documentclass{article} \usepackage{amsmath} \usepackage{amssymb} \usepackage{amsfonts} \thispagestyle{empty} \begin{document} \begin{equation} M(<R)=4\pi\rho_0R_s^3(\ln(\frac{R+R_s}{R_s})-\frac{R}{R+R_s})\notag \end{equation} \end{document}