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=4/5x=4/5-3/5x=1/5y-2/7=6/7y=6/7+2/7y=8/7=1 1/711/25-k=7/25-k=7/25-11/25-k=-4/25k=4/25d+2/9=1/9+7/9d=1/9+7/9-2/9d=6/9d=2/3