Solve for a
a=\frac{64}{r^{5}}
r\neq 0
Solve for r
r=2\sqrt[5]{\frac{2}{a}}
a\neq 0
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ar^{5}=64
Swap sides so that all variable terms are on the left hand side.
r^{5}a=64
The equation is in standard form.
\frac{r^{5}a}{r^{5}}=\frac{64}{r^{5}}
Divide both sides by r^{5}.
a=\frac{64}{r^{5}}
Dividing by r^{5} undoes the multiplication by r^{5}.
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