1/3-2/7x=6/7-x,x=얼마 입 니까?

1/3-2/7x=6/7-x,x=얼마 입 니까?

1/3-2/7x=6/7-x
x-2/7x=6/7-1/3
5/7x=18/21-7/21
5/7x=11/21
x=11/21*7/5
x=11/15