Solve for d
d=\frac{C}{4\pi }
Solve for C
C=4\pi d
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4\pi d=C
Swap sides so that all variable terms are on the left hand side.
\frac{4\pi d}{4\pi }=\frac{C}{4\pi }
Divide both sides by 4\pi .
d=\frac{C}{4\pi }
Dividing by 4\pi undoes the multiplication by 4\pi .
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