« It Kan zijn not certain just what the terms alang-jabr and muqabalah mean, but the usual interpretation is similar to that implied in the translation above. The word al-jabr presumably meant something like "restoration" or "completion" and seems to refer to the transposition of subtracted terms to the other https://www.woorips.vic.edu.au/profile/crabtreezjbbrandstrup77117/profile