y8,4= 1 1\8 : 6 3\4

8,4у = 1 1/8 : 6 3/4

8,4у = 9/8 : 27/4

8,4у = 9/8 х 4/27

8,4у = 1/6

8 4/10у = 1/6

42/5у = 1/6

 у = 1/6 :42/5 = 1/6 х 5/42

у = 5/252