12 13/45-(у- 5 17/45)= 3 23/45
12 13/45-у+5 17/45 = 3 23/45
-у=3 23/45-17 30/45
-у=158/45-795/45
-у=-637/45
у=14 7/45
12 13/45-(у- 5 17/45)= 3 23/45
12 13/45-у+5 17/45 = 3 23/45
-у=3 23/45-17 30/45
-у=158/45-795/45
-у=-637/45
у=14 7/45