(230+670)-x=410+120.

Question

(230+670)-x=410+120.

Answer 1

900-х=530
-х=530-900
х=900-530 = 370

Answer 2

(230+670)-х=410+120
230+670-х=410+120
-1х=410+120-670-230
-1х=-370
х=-370:(-1)
х=370