Solve:
((3/n)-(2/m))
------------------------
(9m^2)-(4n^2)
-----------------
mn
----- AND / = fraction bars
a/(b/c)=ac/b
((3/n)-(2/m)) mn
*****************
(3m-2n)(3m+2n)
(3m-2m)
*************
(3m-2n)(3m+2n)
1/ (3m+2n)
check my work.