8/9x=1/6×16/51
8/9x=16/306
x=16/306÷8/9
x=12/103
x÷6/35=26/45÷13/25
x÷6/35=10/9
x=10/9×6/35
x=4/21
18/35÷0.6×2/3
=6/7×2/3
=4/7