Question

решите уравнение 2/3-(7/9-а)=1/3

Answer 1

 2/3-(7/9-а)=1/3

7/9-а=2/3-1/3

7/9-а=1/3

а=7/9-1/3

а=4/9

Проверка:

2/3-(7/9-4/9)=1/3

2/3-1/3=1/3

1/3=1/3