and in case 9, \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $${{}\begin{aligned} L & = 2 [\beta +\alpha e_{1}] + [\beta - f(e_{2})] +[\beta -f(e_{1}+e_{2})] <\\ &\quad 4\beta+2\alpha e_{1} - f(e_{1}+e_{2}) <\\ &\quad [\beta \,+\, \alpha e_{2}] \,+\, [ \beta -f(e_{1}) ] +[\beta + \alpha e_{1}] + [\beta +\alpha (e_{1}+e_{2})]\\ & = R1=R2. \end{aligned}} $$ \end{document}L=2[β+αe1]+[β−f(e2)]+[β−f(e1+e2)]<4β+2αe1−f(e1+e2)<[β+αe2]+[β−f(e1)]+[β+αe1]+[β+α(e1+e2)]=R1=R2.