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Example 3: Solving systems by elimination http://www.khanacademy.org/video/solving-systems-by-elimination-3 ---------------------------------------------------------------------- يتناول هذا الفيديو كسألة توضح حل نظام من المعادلات عن طريق الحذف ---------------------------------------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org