Transfer 1 / 9 of the number of students in class 1 of grade 6 to class 2 of grade 6, and the two classes are exactly the same. How many students in class 2 are in class 1

Transfer 1 / 9 of the number of students in class 1 of grade 6 to class 2 of grade 6, and the two classes are exactly the same. How many students in class 2 are in class 1

1-1/9-1/9=7/9
A: it turned out to be 7 / 9