Solve for p
p=\frac{S}{2}
Solve for S
S=2p
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p\times 2=S
Swap sides so that all variable terms are on the left hand side.
2p=S
The equation is in standard form.
\frac{2p}{2}=\frac{S}{2}
Divide both sides by 2.
p=\frac{S}{2}
Dividing by 2 undoes the multiplication by 2.
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