Question

Уравнение
45+(71-b•9)=80

Answer 1

45 + ( 71 - b × 9 ) = 80
45 + 71 - 9b = 80
116 - 9b = 80
9b = 116 - 80
9b = 36
b = 36 : 9 
b = 4                                      
45 + ( 71 - 4 × 9 ) = 80