(10 2/4+x)-1/4=13 3/4
10 2/4+x= 13 3/4 + 1/4
10 2/4+x=14
x=14 - 10 2/4
x=3 2/4
(13 5/7 - x) +2 1/7=4 3/7
13 5/7 - x=4 3/7 - 2 1/7
13 5/7 - x=2 2/7
x=13 5/7 - 2 2/7
x= 11 3/7
(28 5/11-x)-2 7/11=5 9/11
28 5/11-x=5 9/11+2 7/11
28 5/11-x=8 5/11
x=28 5/11 -8 5/11
x=20
(10 2/4+x)-1/4=13 3/4
10 2/4+x= 13 3/4 + 1/4
10 2/4+x=14
x=14 - 10 2/4
x=3 2/4
(13 5/7 - x) +2 1/7=4 3/7
13 5/7 - x=4 3/7 - 2 1/7
13 5/7 - x=2 2/7
x=13 5/7 - 2 2/7
x= 11 3/7
(28 5/11-x)-2 7/11=5 9/11
28 5/11-x=5 9/11+2 7/11
28 5/11-x=8 5/11
x=28 5/11 -8 5/11
x=20