4/1+x=5/8
x-5/8-4/1
x=20/27
x-20/3=10/7
x=10/7+20/3
x=20/17
x+11/2=2/1
x=2/1-11/2
x=22/7
x-8/3=5/2
x=5/2+8/3
x=40/31