What is The Compendious Book on Calculation by Completion and Balancing?
{{Infobox book | italic title = <!--(see above)--> | dewey = | english_pub_date = | published = | media_type = | pages = | awards = | isbn = | oclc = | set_in = | publisher = | congress = | preceded_by = | followed_by = | native_wikisource = ar:%D8%A7%D9%84%D9%85%D8%AE%D8%AA%D8%B5%D8%B1_%D9%81%D9%8A_%D8%AD%D8%B3%D8%A7%D8%A8_%D8%A7%D9%84%D8%AC%D8%A8%D8%B1_%D9%88%D8%A7%D9%84%D9%85%D9%82%D8%A7%D8%A8%D9%84%D8%A9 | wikisource = | notes = | exclude_cover = | publisher2 = | pub_date = | isbn_note = | title_working = | orig_lang_code = ar | image_size = | border = | alt = title page in Arabic writing and calligraphy; hand-drawn ornamental frame; parchment is gilded and stained from age | caption = title page, 9th century | author = Muhammad ibn Musa al-Khwarizmi | audio_read_by = | title_orig = كتاب المختصر في حساب الجبر والمقابلة <!-- cancel usual italics for titles -- non-Roman alphabets shouldn't use italics --> | genre = [[Mathematics]] | translator = | name = | illustrator = | cover_artist = | country = [[Abbasid Caliphate]] | language = Arabic | series = | release_number = | subject = [[Algebra]] | image = Image-Al-Kitāb al-muḫtaṣar fī ḥisāb al-ğabr wa-l-muqābala.jpg | website = }} '''''The Compendious Book on Calculation by Completion and Balancing''''' ({{lang-ar|ٱلْكِتَاب ٱلْمُخْتَصَر فِي حِسَاب ٱلْجَبْر وَٱلْمُقَابَلَة}}, ''al-Kitāb al-Mukhtaṣar fī Ḥisāb al-Jabr wal-Muqābalah''; {{lang-la|Liber Algebræ et Almucabola}}), also known as '''''Al-Jabr''''' ({{lang|ar|ٱلْجَبْر}}), is a mathematical book on [[algebra]] written by [[Al-Khwarizmi|Muḥammad ibn Mūsā al-Khwārizmī]] around 820&nbsp;CE. ''Al-Jabr'' was important in the [[history of ma