Answer
$\color{blue}{\dfrac{2}{3}}$
Work Step by Step
Factor the numerator and the denominator then cancel the common factors to obtain:
$\require{cancel}
=\dfrac{10(2r+1)}{15(2r+1)}
\\=\dfrac{\cancel{10}^2\cancel{(2r+1)}}{\cancel{15}^3\cancel{(2r+1)}}
\\=\color{blue}{\dfrac{2}{3}}$
