18/23 - ( 7/23 + у ) = 5/23

Question

18/23 - ( 7/23 + у ) = 5/23

Answer 1

18/23-(7/23+у)=5/23
7/23+у=18/23-5/23
7/23+у=13/23
у=13/23-7/23
у=6/23
Проверка
18/23-(7/23+6/23)=5/23
18/23-13/23=5/23
              5/23=5/23

Answer 2

18/23 - ( 7/23 + у ) = 5/23
18/23 - 7/23 - у = 5/23
11/23 - у = 5/23
11/23 - 5/23 = у
у = 6/23