3/5+x=4/5
y-2/7=6/7
11/25-k=7/25
d+2/9=1/9+7/9
3/5+x=4/5 x=4/5-3/5 x=1/5 y-2/7=6/7 y=6/7+2/7 y=8/7=1 1/7 11/25-k=7/25 -k=7/25-11/25 -k=-4/25 k=4/25 d+2/9=1/9+7/9 d=1/9+7/9-2/9 d=6/9 d=2/3