kak tolongin dong ngerjainnya

[tex] \frac{3}{x+1}+ \frac{3}{x-1} = \frac{3(x-1)+3(x+1)}{(x+1)(x-1)} = \frac{3x-3+3x+3}{ x^{2} -1}= \frac{6x}{ x^{2} -1} [/tex]