уравнение (38+b)*12=840
(38+b)*12=84038+b=840/1238+b=70
b=70-38
b=32
(38+b)*12=840
456+12b=840
12b=840-456
12b=384
b=384:12
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Verified answer
(38+b)*12=840
38+b=840/12
38+b=70
b=70-38
b=32
Verified answer
(38+b)*12=840
456+12b=840
12b=840-456
12b=384
b=384:12
b=32