Solve for p
p=\frac{x-8}{3}
Solve for x
x=3p+8
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3p=x-8
Swap sides so that all variable terms are on the left hand side.
\frac{3p}{3}=\frac{x-8}{3}
Divide both sides by 3.
p=\frac{x-8}{3}
Dividing by 3 undoes the multiplication by 3.
x=3p+8
Add 8 to both sides.
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