Question

Реши уравнения:(580:b-25)*90+490=850 ПОМОГИТЕ ПЛИЗ

Answer 1

(580:b-25)*90+490=850
(580:b-25)*90 = 850-490
(580:b-25)*90 = 360
580:b-25 = 360/90
580:b-25 = 4
580:b = 4+25
580:b = 29
b = 580/29
b = 20