Answer
$\frac{2}{3r^3}$
Work Step by Step
Reduce the coefficient. Then subtract the exponents.
$\frac{2}{3}r^{-3-(-6)}$
Simplify the exponent.
$\frac{2}{3}r^{-3+6}=\frac{2}{3}r^{-3}$
Rewrite the negative exponent with positive one.
$\frac{2}{3r^3}$
