My Question is this:

(12p²q-³r)-³ / 144q^7

-------------_________

----------------5p²

Note: Last part is 144q^7 OVER 5p², not all over 5p²

I have attempeted the first part and ended up with -1728p^4q^-9r³.

Am i on the right track here? If so where do i go from here? How do i do the 144q^7 over 5p², and then incorporate it back into the -1728... part?