Question 881820
You are expecting that the function as its own input will be x?  


{{{f(y)=(3((3x+7)/(4x-9))+7)/(4((3x+7)/(4x-9))-9)}}}


Multiply top and bottom by {{{4x-9}}}


{{{((3((3x+7)/(4x-9))+7)/(4((3x+7)/(4x-9))-9))((4x-9)/(4x-9))}}}


{{{(3(3x+7)+7(4x-9))/(4(3x+7)-9(4x-9))}}}


{{{(9x+21+28x-63)/(12x+28-36x+81)}}}


{{{(37x-42)/(-24x+109)}}}


<b>NO!  That is not x.</b>



Did you really intend the term, {{{7/4x}}} in the original function definition?