Question

В + 123 = 354

421 - x = 379
помогите пж

Answer 1

1) В= 354-123
В=231
2)x=421-379
x=42

Answer 2

1) b+123=354
b=354-123
b=231
-------------
231+123=354
354=354

2) 421-х=379
х=421-379
х=42
------------
421-42=379
379=379