You can put this solution on YOUR website! Not too much you can do here, but from
5x/x^2-9 + 2/x+4 we can combine fractions and get
[5x(x + 4) + 2(x^2 - 9)] / [(x + 4)(x - 3)(x + 3)] =
[5x^2 + 20x + 2x^2 - 18] / [(x + 4)(x - 3)(x + 3)] =
(7x^2 + 20x - 18) / [(x + 4)(x - 3)(x + 3)]