10 3/5x=25/72 8/9x=1/6×16/51
3/5x÷3/5＝25/72÷3/5 8/9x÷8/9＝8/153÷8/9
x=125/216 x=1/17
x÷6/35＝26/45÷13/25
x÷6/35×6/35＝10/9×6/35
x=4/21