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\begin{document}
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  \
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  % DÉBUT DE L'ÉNONCÉ
  \exercice

  Déterminer les solutions de l'équation $3x+2=-x-1$. Si nécessaire, les solutions seront arrondies au centième.

  % FIN DE L'ÉNONCÉ
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

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  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  % DÉBUT DU CORRIGÉ
  \exercice*

  \begin{align*}
    3x+2 &= -x-1 \\
    3x+x &= -1-2 \\
    4x &= -3 \\
    x &= -\frac{3}{4} \\
    x &= -0,75
  \end{align*}

  L'unique solution est $x=-0,75$.

  % FIN DU CORRIGÉ
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

  \label{LastCorPage}
\end{document}
