уравнение (38+b)*12=840

Question

уравнение (38+b)*12=840

Answer 1

 (38+b)*12=840

456+12b=840

12b=840-456

12b=384

b=384:12

b=32

Answer 2

(38+b)*12=840
38+b=840/12
38+b=70

b=70-38

b=32