X:(910-890)=60. (560-y):8=30. (900-w)*60=5400. 3500:50-z=7

х : (910 - 890) = 60х = 60 * (910 - 890)х = 60 * 20х = 1200Проверка: 1200 : (910 - 890) = 60                   1200 : 20 = 60                   60 = 60 (560 - у) : 8 = 30560 - у = 30 * 8560 - у = 240у = 560 - 240у = 320Проверка: (560 - 320) : 8 = 30                   240 : 8 = 30                   30 = 30(900 - w) * 60 = 5400900 - w = 5400 : 60900 - w = 90w = 900 - 90w = 810Проверка: (900 - 810) * 60 = 5400                  90 * 60 = 5400                  5400 = 5400 3500 : 50 - z = 7z = 3500 : 50 - 7z = 70 - 7z = 63Проверка: 3500 : 50 - 63 = 7                  70 - 63 = 7                  7 = 7