\documentclass[12pt,a4paper]{article}
\usepackage{ProfCollegeLua}
\usepackage{unicode-math}
\setmathfont{LeteSansMath}[math-style=french,Scale=0.92]
\setmainfont{Lato}[Scale=0.92]
\usepackage[margin=1cm,noheadfoot]{geometry}
\pagestyle{empty}
\begin{document}
\ResolEquation[Lettre=t,Entier,Simplification,Solution]{6}{-3}{1}{2}
\par\hfill\phantom{t}
\end{document}