documentclass[a4paper, 11pt]{article}

%For math commands
usepackage{amsmath}

%For spacing options in lists (enumerate, itemize, description)
usepackage{enumitem}

begin{document}
begin{itemize}[label = {--}, leftmargin = 25mm]

[ sum_{i in V} x_{ij} = 1 quad forall j in V backslash {0} tag{2}]

item From any customer vertex, the total inflow should be of exactly 1 edge

[ sum_{j in V} x_{ij} = 1 quad forall j in V backslash {0} tag{3}]

item The outflow from any customer vertex should be exactly 1 edge
end{itemize}
end{document}

begin{document}
[ sum_{i in V} x_{ij} = 1 quad forall j in V backslash {0} tag{2}]

begin{itemize}[label = {--}, leftmargin = 25mm]

item From any customer vertex the total inflow should be of exactly 1 edge

[ sum_{j in V} x_{ij} = 1 quad forall j in V backslash {0} tag{3}]

item The outflow from any customer vertex should be exactly 1 edge
end{itemize}
end{document}