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\documentclass{article}
\usepackage{amsmath} % pkg required by EasyLatex
\usepackage{amsfonts} % pkg required by EasyLatex
\usepackage{amssymb} % pkg required by EasyLatex
\usepackage{psfrag} % pkg required by EasyLatex
\usepackage[dvips]{graphicx} % pkg required by EasyLatex
\begin{document}
\begin{align*}
&C(v_1) + C(v_2) + C(v_5) + C(v_6)
\\&\geq C(v_1) + C(v_2) + C(v_5) + C(v_6) - 2*c(v_1, v_2)
\\&= C(v_1,v_2) + C(v_5) + C(v_6)
\\&\geq C(v_1,v_2) + C(v_5) + C(v_6) - 2*c(v_1 v_2, v_6)
\\&= C(v_1,v_2, v_6) + C(v_5)
\\&\geq C(v_1,v_2, v_3) + C(v_5) & \textrm{ if $v_6$ is connected to $v_1$ or $v_2$}
\\&\geq C(v_1,v_2, v_3) + C(v_5) - 2*c(v_1 v_2 v_3, v_5)
\\&= C(v_1,v_2, v_3, v_5)
\\&\geq C(v_1,v_2, v_3, v_4) & \textrm{ if $v_5$ is connected to $v_1$ or $v_2$ or $v_3$}
\end{align*}
\end{document}
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