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Testing a solution for a system of equations http://www.khanacademy.org/video/testing-a-solution-for-a-system-of-equations ---------------------------------------------- يتناول هذا الفيديو فحص لحل لنظام من المعادلات ---------------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org