Question

6   5/27-(х-1   2/9)=3   20/81

Answer 1

1) 6 5/27-(X-1 2/9)=3 20/81
6 5/27 умножаем на 3=6 15/81
1 2/9 умножаем на 9= 1 18/81
и так
6 15/81-(x-1 18/81)= 3 20/81
6 15/81 - 3 20/81= 2 76/81
2 76/81+ 1 18/81= 3 94/81=4 13/81 
проверка
6 15/81-( 4 13/81-1 18/81)=6 15/81-2 76/81= 3 20/81