$\displaystyle \frac {3x}{x+2} - \frac {x-2}{x+2}$
Meowwwwwwwwww, nice LaTex Format!!!
Just like the last problem, your denominators match, so we just subtract the numerators:
$\displaystyle \frac {3x - x + 2}{x+2}$
combine x terms:
$\displaystyle \frac {2x + 2}{(x + 2)}$
I don't see that this can be simplified any more.