Solve for w
w=\frac{P-21}{2}
Solve for P
P=2w+21
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21+2w=P
Swap sides so that all variable terms are on the left hand side.
2w=P-21
Subtract 21 from both sides.
\frac{2w}{2}=\frac{P-21}{2}
Divide both sides by 2.
w=\frac{P-21}{2}
Dividing by 2 undoes the multiplication by 2.
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