35+х = 200-140
35+х = 60
х = 60-35
х = 25
490-х = 100+210
490-х = 310
х = 490-310
х = 180
200+х = 280+600
200+х = 880
х = 880-200
х = 680
а-(47+33) = 310+210
а-80 = 520
а = 520+80
а = 600
у+230 = 9×4+640
у+230 = 36+640
у+230 = 676
у = 676-230
у = 446
(230+670)-х = 410+120
900-х = 530
х = 900-530
х = 370