12/(x-3)(x+3):3/x+3 sederhanakanlah

[tex] \frac{ \frac{12}{(x - 3)(x + 3)} }{ \frac{3}{x + 3} } (coret \: x + 3) = \\ \frac{ \frac{12}{x - 3} }{3} = \frac{4}{x - 3} [/tex]

semoga membantu