1/3÷x=4
x=1/3÷4
x=1/12
1/5×8÷x=6/25
8/5÷x=6/25
x=8/5×25/6
x=20/3
2/3-x=1/6
x=2/3-1/6
x=1/2
(1-5/8)x=5/16
3x/8=5/16
x=5/16×8/3
x=5/6
1/3÷x=4
x=1/3÷4
x=1/12
1/5×8÷x=6/25
8/5÷x=6/25
x=8/5×25/6
x=20/3
2/3-x=1/6
x=2/3-1/6
x=1/2
(1-5/8)x=5/16
3x/8=5/16
x=5/16×8/3
x=5/6