Answer
$\dfrac{2}{5}$
Work Step by Step
We cancel out common terms that are both in the numerator and the denominator after simplifying.
$\require{cancel}=\dfrac{6x^6}{15x^6}
\\=\dfrac{6\cancel{x^6}}{15\cancel{x^6}}
\\=\dfrac{6}{15}
\\=\dfrac{2}{5}$
