Solve for b
b=\frac{400000}{f^{21}}
f\neq 0
Solve for f
f=\sqrt[21]{\frac{400000}{b}}
b\neq 0
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bf^{21}=400000
Swap sides so that all variable terms are on the left hand side.
f^{21}b=400000
The equation is in standard form.
\frac{f^{21}b}{f^{21}}=\frac{400000}{f^{21}}
Divide both sides by f^{21}.
b=\frac{400000}{f^{21}}
Dividing by f^{21} undoes the multiplication by f^{21}.
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