Answer
$\color{blue}{\dfrac{r+2}{r+4}}$
Work Step by Step
Factor the numerator and the denominator then cancel the common factors to obtain:
$\require{cancel}
=\dfrac{(r-3)(r+2)}{(r+4)(r-3)}
\\=\dfrac{\cancel{(r-3)}(r+2)}{\cancel{(r-3)}(r+4)}
\\=\color{blue}{\dfrac{r+2}{r+4}}$
