Solve for u
u=\frac{P}{6\pi }
Solve for P
P=6\pi u
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6\pi u=P
Swap sides so that all variable terms are on the left hand side.
\frac{6\pi u}{6\pi }=\frac{P}{6\pi }
Divide both sides by 6\pi .
u=\frac{P}{6\pi }
Dividing by 6\pi undoes the multiplication by 6\pi .
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