(230+670)-x=410+120
900 - х = 530
- х = 530 - 900
- х = - 370
х = 370
900-x=530
-x=530-900
-x=-370
x=370
(230+670)-x=410+120
900 - х = 530
- х = 530 - 900
- х = - 370
х = 370
(230+670)-x=410+120
900-x=530
-x=530-900
-x=-370
x=370