Solve for k
k=\frac{G}{8\pi }
Solve for G
G=8\pi k
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8\pi k=G
Swap sides so that all variable terms are on the left hand side.
\frac{8\pi k}{8\pi }=\frac{G}{8\pi }
Divide both sides by 8\pi .
k=\frac{G}{8\pi }
Dividing by 8\pi undoes the multiplication by 8\pi .
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