3целых 1/4+1/2у +1 целая1/3 +5/6у=5 целых 11/12

3 1/4 + 1/2у + 1 1/3 + 5/6у = 5 11/12

1/2у + 5/6у = 5 11/12 - 3 1/4 - 1 1/3

3/6у + 5/6у = 5 11/12 - 3 3/12 - 1 4/12

8/6у = 1 4/12 = 1 1/3

у = 1 1/3 : 8/6

у = 4/3 * 6/8

у = 24/24

у = 1 

3 целых 1/4+1/2у +1 целая1/3 +5/6у=5 целых 11/1213/4+1/2у+4/3+5/6у=71/12
55/12+4/3у=71/12
4/3у=71/12-55/12
4/3у=4/3
у=1