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\documentclass[12pt]{article}

\begin{document}

\section{Ajouts de fractions}

Adding two fractions
%- set e = Expression.random("{a} / {b} + {c} / {k*b}", ["b > 1", "k>1"])
\[
    A = \Var{e}
\]
Solution 
\[
    \Var{e.simplify().explain() | join('=')}
\]

\end{document}
