Explanation:
= 2x / (( x+3)(x-3)) - 5 / ((x -4)(x+3))
multiply L term by (x-4)/ (x-4) and the R term by (x-3)/(x-3)
to get a common denominator
[ 2x (x-4) - 5(x-3) ] / ((x-3)(x+3)(x-4) then simplify a bit to get
(2x^2 -13x +15 ) ((x-3)(x+3)(x-4) Done.