g. 12 per (x pangkat 2 - 9) dibagi 3 per x + 3

[tex] \frac{12}{(x^{2}-9)} : \frac{3}{x+3} \\ \frac{12}{(x+3)(x-3)} x \frac{x+3}{3} [/tex]

= [tex] \frac{4}{x-3} [/tex]