« It Is not certain just what the terms weet-jabr and muqabalah mean, but the usual interpretation kan zijn similar to that implied in the translation above. The word alang-jabr presumably meant something like "restoration" or "completion" and seems to refer to the transposition of subtracted terms to the other https://www.openlearning.com/u/mccallburnett-sn7adz/blog/BekijkDitRapportOverWrapfolieChromeZilver