« It Is 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 alang-jabr presumably meant something like "restoration" or "completion" and seems to refer to the transposition ofwel subtracted terms to the other side https://emery-dogan.blogbright.net/de-5-seconden-trick-voor-wrapfolie-rvs