Answer
$\dfrac{r+2}{r+4}$
Work Step by Step
Simplify by factoring the numerator and the denominator then cancelling common factors to have:
$\require{cancel}
\\=\dfrac{(r-3)(r+2)}{(r+4)(r-3)}
\\=\dfrac{\cancel{(r-3)}(r+2)}{(r+4)\cancel{(r-3)}}
\\=\dfrac{r+2}{r+4}$
