6877 - х = 2000 + 984
6877 - х = 2984
х = 6877 - 2984
х = 3893
6877 - 3893 = 2000 + 984
2984 = 2984
а + 354 = 412 + 48
а + 354 = 460
а = 460 - 354
а = 106
106 + 354 = 412 + 48
460 = 460
29400 : х = 700 × 21
29400 : х = 14700
х = 29400 : 14700
х = 2
29400 : 2 = 700 × 21
14700 = 14700
419 + х = 209 × 4
419 + х = 836
х = 836 - 419
х = 417
419 + 417 = 209 × 4
836 = 836