Cfrgtkky

I want to replicate this:

However I got this:

Can anyone help me please?

My MWE is this:

immediatewrite18{makeindex jobname.nlo -s nomencl.ist -o jobname.nls}

documentclass[a4paper,11pt,oneside]{book}

usepackage[utf8]{inputenc}

usepackage[T1]{fontenc}

usepackage{mathpazo}

usepackage{geometry}

usepackage[colorinlistoftodos]{todonotes}

usepackage{tablefootnote}

usepackage{graphicx}

usepackage{adjustbox}

usepackage{array}

usepackage{mathtools}

usepackage{float}

usepackage{subfig}

%, nccmath}

usepackage{siunitx} 

usepackage{mhchem}

usepackage{chemfig}    

usepackage[colorinlistoftodos]{todonotes}

usepackage[autostyle]{csquotes}

usepackage{multirow}

usepackage{xcolor}

usepackage{booktabs}

usepackage{soul}

usepackage{acro}

usepackage{pgfplots}

usepackage{enumitem}

usepackage{lscape}

usepackage{tabularx}

usepackage{nomencl}

makenomenclature

usepackage{amsmath}

usepackage{lipsum}

%usepackage[toc,page]{appendix}

%usepackage{tikz}

usetikzlibrary{intersections, calc}

pgfplotsset{compat=1.14}

usepackage{filecontents}

acsetup{first-style=short}



usepackage[backend=bibtex,style=authoryear,natbib=true]{biblatex} 



addbibresource{example.bib}



begin{document}



begin{equation}

begin{split}

mathbold{min}~ nabla f(x)^{T} d  + frac{1}{2} d^{T} Hd \

mathbold{s.t.}~ g_{j}(x) + nabla g_{j}(x)^{T} d leq 0 , quad j  = 1, ..., m, \

g_{j}(x) + nabla g_{j}(x)^{T} d = 0 quad j = m +1, ..., m+l,

end{split}

end{equation}



end{document}

A solution with two (nested) alignedat environments. I removed all unrelated packages. Note you don't have to load amsmath if you load mathtools – the latter does it for you:

documentclass[a4paper, 11pt, oneside]{book}

usepackage[utf8]{inputenc}

usepackage[T1]{fontenc}

usepackage{mathpazo}

usepackage{geometry}

usepackage{mathtools}



begin{document}



begin{equation}

begin{alignedat}{2}

 & mathbold{min} & enspace & nabla f(x)^{T} d + frac{1}{2} d^{T} Hd \

 & mathbold{s.t.} & & begin{alignedat}[t]{2}

g_{j}(x) + nabla g_{j}(x)^{T} d & leq 0 , & quad j & = 1, ..., m, \

g_{j}(x) + nabla g_{j}(x)^{T} d & = 0 & j & = m +1, ..., m+l,

end{alignedat}

end{alignedat}

end{equation}



end{document}