Why is $-2 = -64 \cdot r^{-5} \implies \frac 1{32} = \frac{1}{r^5}$?

Question

What are the steps Khan Academy uses to simplify from $-2 = -64 \cdot r^{-5}$ to $\frac 1{32} = \frac{1}{r^5}$?

Answer 1

Simple. Divide both sides by $-64$ to yield

$$ \frac{-2}{-64} = r^{-5} $$

and, by definition (and after simplifying the fraction on the left),

$$ \frac{1}{32} = \frac{1}{r^5}. $$