Align text under variables

Question

Is there any easy way to align the conditions under the equation? As you can see the less equal zero condition is not vertically aligned.
documentclass[border=10pt]{standalone}
usepackage[utf8]{inputenc}
usepackage{amsmath}
begin{document}

$
Omega =-underset{ge 0}{gamma}underset{ge 0}{(b-Ax)}+
        underset{ge 0}{(x-l)}underset{ge 0}{alpha}+
        underset{ge 0}{(u-x)}underset{ge 0}{-beta}+
        underset{ge 0}{(c-gamma A-alpha I-beta I)}underset{ge 0}{x}
        $
end{document}

user238301 · Accepted Answer

The following defined Funderset that inserts a mathstrut as part of the underset construction. You can change this by supplying a different first (optional) argument.
documentclass[border=10pt]{standalone}
usepackage[utf8]{inputenc}
usepackage{amsmath}
newcommandFunderset[3][mathstrut]{underset{#1#2}{#1#3}}
begin{document}

$
Omega =-Funderset{ge 0}{gamma}Funderset{ge 0}{(b-Ax)}+
        Funderset{ge 0}{(x-l)}Funderset{ge 0}{alpha}+
        Funderset{ge 0}{(u-x)}Funderset{ge 0}{-beta}+
        Funderset{ge 0}{(c-gamma A-alpha I-beta I)}Funderset{ge 0}{x}
        $
end{document}

Align text under variables

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