Решите уравнения : 3а+291 = 636 и 5R-296 = 489

Question

Решите уравнения : 3а+291 = 636 и 5R-296 = 489

Answer 1

3а=636-291
3а=345
А=345:3
А=115
3*115+292=636
636=636

5r=489+296
5r=785
R=785:5
R=157
5*157-296=489
489=489

Answer 2

3a=636-291
3a=345
a=69

5R-296=489
5R=785
R=157