Translate the following English sentence to French:
"In fact, Article 86 of the EC Treaty, formerly Article 90, stipulates that services of general economic interest are subject to the rules on competition only insofar as the application of such rules does not obstruct the performance of the particular tasks assigned to them."
En effet, l' article 86 du traité instituant la Communauté, l' ex-article 90, prévoit que les services d' intérêt économique général sont soumis aux règles de concurrence dans les limites où l' application de ces règles ne fait pas échec à leur mission.