simplify the c omplex fraction:

6y/11 divided by 6y/11 - 30/y

If I read that as you typed it ...

(6y/11) ÷ (6y/11) - 30/y , then
= 1 - 30/y
= (y-30)/y

somehow I don't feel that is what you meant.
Please check your typing and use brackets.