7Ⅹ+1/3×26＝9
7Ⅹ+26/3＝9
7Ⅹ=9-26/3
7Ⅹ=1/3
Ⅹ=1/3÷7
Ⅹ=1/21
5/9Ⅹ＝30×2/3
5/9Ⅹ＝20
Ⅹ＝20÷5/9
Ⅹ＝36