Răspuns :
x+1/4=3/4
x=3/4-1/4
x=2/4
x=1/2
1/2+x=1
x=1-1/2
x=2/2-1/2
x=1/2
4/5-x=1/5
-x=1/5-4/5
-x=-3/5
x=3/5
x-4/6=1
x=1+4/6
x=6/6+4/6
x=10/6
x=5/3
x=3/4-1/4
x=2/4
x=1/2
1/2+x=1
x=1-1/2
x=2/2-1/2
x=1/2
4/5-x=1/5
-x=1/5-4/5
-x=-3/5
x=3/5
x-4/6=1
x=1+4/6
x=6/6+4/6
x=10/6
x=5/3