\documentclass[12pt]{article}
\usepackage{amsmath,amssymb}
\DeclareFontEncoding{LS2}{}{\noaccents@}
\DeclareFontSubstitution{LS2}{stix}{m}{n}
\DeclareSymbolFont{xlargesymbols}{LS2}{stixex}{m}{n}
\DeclareMathDelimiter{\lbrace}{\mathopen}{operators}{"7B}{xlargesymbols}{"00}
\DeclareMathDelimiter{)}{\mathclose}{operators}{"7D}{xlargesymbols}{"01}
\begin{document}
\textbf{Question.} $A=\{x \ : \ x>0\}$.
\end{document}
I am getting such weired output
What has happened? Where have i gone wrong? Can anyone help

