у+2 11/52 равно 7 5/39

y+ 2 11/52 = 7 5/39

y=7 5/39 - 2 11/52 

y= 6  44/39 - 2 11/52

y= (6-2) (44/39-11/52)

y=4  44*4-11*3/156 

y= 4  176-33/156

y=4  143/156