1) х + (619 - 392) = 719 + 320х + 227 = 1039х = 1039 - 227х = 812
2) 120 + 880 + х = 56 * 501000 + х = 2800х = 2800 - 1000х = 1800
1) х + (619 - 392) = 719 + 320
х + 227 = 1039
х = 1039 - 227
х = 812
2) 120 + 880 + х = 56 * 50
1000 + х = 2800
х = 2800 - 1000
х = 1800