5/9 x=7/8
x=7/8÷5/9=7/8×9/5=63/40
x÷5/9=10/27
x=10/27×9/5=2/3
7/9 x=4/5×75/96
x=4/5×75/96÷7/9=4/5×75/96×9/7=45/56