x+4/9=3/5 X=3/5-4/9 X=7/45 9/10-x=3/5 X=9/10+3/5 X=15/10 x+7/18=5/9 X=5/9-7/18 X=1/6 7/16+x=5/24 X=5/24-7/16 X=-11/24 x-(4/7-1/3)=19/21 X-5/21=19/21 X=5/21+19/21 X=8/7 8/15+x=5/6 X=5/6-8/15 X=3/10