korepanovgrish

Verified answer

1/4+y=3/7

y=3/7-1/4=12/28-7/28

y=5/28

y-5/12=3/10

y=3/10+5/12=18/60+25/60

y=43/60

y+4/11=3/5

y=3/5-4/11=33/55-20/55

y=13/55

4/15+y=11/25

y=11/25-4/15=33/75-20/75

y=13/75