Ответ:Решение:933 - x = 903x = 933 - 903x = 30y - 53 = 800y = 800 + 53y = 853c + 955 = 1000c = 1000 - 955c = 45989 + a = 991a = 991 - 989a = 2Ответ: x = 30, y = 853, c = 45, a = 2.