А - 986 = 3974 а = 3974 + 986 а = 4960 ---------------------------- у + 1138 = 4000 у = 4000 - 1138 у = 2862 --------------------------- х - 2765 = 7081 х = 7081 + 2765 х = 9846 --------------------------- к + 40521 = 50521 к = 50521 - 40521 к = 10000